Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6be6c96d9d8b151…

MALICIOUS

PDF

40.4 KB Created: 2020-07-20 02:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: b73f5c04d4f5b72488ce4d01678ad6d0 SHA-1: 7a820994288c3712ae8d697cf4d31b58ce2569fc SHA-256: a6be6c96d9d8b151d427c2dcb9481218dab03ed853113680b6ee268fc4734ad8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to funnel users to external sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.com/wb?keyword=oswaal%20books%20class%209%20pdf In PDF document text
    • http://files.jhaytersmilestudio.co.uk/uploads/1/3/1/3/131379546/puxofexelema-xovuze.pdfIn PDF document text
    • http://files.angieskonacoffee.com/uploads/1/3/2/3/132302924/9876172.pdfIn PDF document text
    • http://files.liquidsunshinedesigns.net/uploads/1/3/1/6/131606644/6427307.pdfIn PDF document text
    • http://files.innerframework.org/uploads/1/3/1/4/131453268/0d449b1710b.pdfIn PDF document text
    • http://files.integritydetailcookeville.com/uploads/1/3/2/6/132680986/gugonidugo.pdfIn PDF document text
    • http://files.igccb.org/uploads/1/3/0/7/130739369/db1be2540.pdfIn PDF document text
    • http://files.newparkclosefrc.com/uploads/1/3/1/4/131406807/kafavexiwoke_mijegak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zexixomiwos.files.wordpress.com/2020/06/25052775313.pdfIn PDF document text
    • https://gugibuno158581699.files.wordpress.com/2020/06/dixuk.pdfIn PDF document text
    • https://fukigus.files.wordpress.com/2020/07/6684628864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/53274284624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3581/9164/files/julux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/21920803143.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/24901482887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3144/5156/files/nozagebarenot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/71032746210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1250/5243/files/jumemivabekonixijasukuza.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_off000060fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FE 4968 bytes
SHA-256: 59722dad5f15e6347c3df15dc7f655ef240758e436d7be6315122a0f4bade153
font_01_sfnt_off000071ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71EE 10156 bytes
SHA-256: d5c9a0a0cf42c0d65f78c1fe6cdce3c37db319fa75b3a936f068b51287f11247

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