Malicious PDF — malware analysis report

Static analysis result for SHA-256 03dc6d658de16bcc…

MALICIOUS

PDF

54.3 KB Created: 2020-07-10 14:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 5b7ba3033edb9b65cbb878decd4682cd SHA-1: 17343341d062328839252b3648fdf1d37a522cd5 SHA-256: 03dc6d658de16bcc75dd514fa87aaeabaed0165811640045c5b5491107947298
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to redirector infrastructure and a link farm of other PDFs, suggesting a phishing or malware distribution scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a redirector and part of a link farm. The document body, though obfuscated, contains URLs that are also listed as IOCs.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/pify?keyword=aviation+security+international+magazine+pdf In PDF document text
    • http://files.markhamgolf.net/uploads/1/3/1/3/131384771/76463.pdfIn PDF document text
    • http://files.rvasings.org/uploads/1/3/2/8/132815178/45c615b5f.pdfIn PDF document text
    • http://files.totalprosoccer.com/uploads/1/3/0/7/130775195/8220289.pdfIn PDF document text
    • http://files.dinytots.com/uploads/1/3/2/7/132741149/693bc5.pdfIn PDF document text
    • http://files.sisiholisticbeauty.com/uploads/1/3/1/4/131438571/bovigevudo.pdfIn PDF document text
    • http://files.thecherryspringsranch.com/uploads/1/3/1/6/131606674/6205286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zinetexis.files.wordpress.com/2020/07/dafulubukutukaf.pdfIn PDF document text
    • https://senuxubu.files.wordpress.com/2020/06/38777055149.pdfIn PDF document text
    • https://pinuraliwa9571753.files.wordpress.com/2020/06/58582901741.pdfIn PDF document text
    • https://vuxiluxuda.files.wordpress.com/2020/07/19150826234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafitizeruzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/6614167855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.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 7

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_off000094ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EF 5560 bytes
SHA-256: 3473f3877c6b2f9af5f82e5e52c69b2dd2e38eba89ca438180e442aab460e06c
font_01_sfnt_off0000a7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D6 10620 bytes
SHA-256: e75405f0921155efb5552bab4c734a3d9e353ff99ea7c0b779f96bcf2e72118f

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