Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5357b23f520b2d…

MALICIOUS

PDF

49.6 KB Created: 2020-07-16 17:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 0fe190e79d69610e71ef9a965a139048 SHA-1: 6c9950870d4516df90fbea82b361c0cedc3e4313 SHA-256: 8a5357b23f520b2d6209b2084a89b39cd427476d03ea7150a33d6a9f34063b09
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links to external PDF files, a technique often used for SEO manipulation or to host malicious content. One critical heuristic indicates a link to known malicious redirector infrastructure. Another heuristic flags the document as a callback phishing lure, suggesting it may prompt the user to call a number for fake support or to resolve a fraudulent charge. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=program%20festival%20enescu%202017%20pdf In PDF document text
    • http://files.pearladamswgi.com/uploads/1/3/1/1/131164090/dilupavunadixot.pdfIn PDF document text
    • http://files.mitchellmillermusic.com/uploads/1/3/1/3/131398222/408135.pdfIn PDF document text
    • http://files.launcestonlittleathleticscentre.org/uploads/1/3/0/8/130813768/2969109.pdfIn PDF document text
    • http://files.braverthanthewaves.com/uploads/1/3/1/4/131453807/5359755.pdfIn PDF document text
    • http://files.acjs-mws.org/uploads/1/3/1/3/131379134/104b8f3f.pdfIn PDF document text
    • http://files.mybabybooksa.com/uploads/1/3/1/3/131380337/2c139b8cfe6a.pdfIn PDF document text
    • http://files.campmi.org/uploads/1/3/1/4/131405948/junewowufonunuvoger.pdfIn PDF document text
    • http://files.biddingerlab.org/uploads/1/3/1/4/131437976/1803646.pdfIn PDF document text
    • http://files.joemillsaps.com/uploads/1/3/0/7/130739457/2f4d954.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tixobumot.files.wordpress.com/2020/07/kubuk.pdfIn PDF document text
    • https://dupalusojo.files.wordpress.com/2020/06/dixuxop.pdfIn PDF document text
    • https://zigozeposuze.files.wordpress.com/2020/06/lefewanexiwegodagawe.pdfIn PDF document text
    • https://dojivoxavinu.files.wordpress.com/2020/06/feroxukesuneb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/xokilaloxonuzibekutukexaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/50439832448.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/75179799764.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/suviraripeforufenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/tojefafinalegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2318/7618/files/39499557719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/91000257843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9588/3925/files/76405009036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7C 5824 bytes
SHA-256: c9fb681ad4bc1cde103a78d4cd55debdcfc05673fbf075d13252b626ad131866
font_01_sfnt_off00009344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9344 11420 bytes
SHA-256: bd4f9ea39e4bbd8e9c602a6b69b3c7a11af714df5c2a8fcbf94fb3743586b1e9

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