Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d123e046b4f2f21…

MALICIOUS

PDF

95.8 KB Created: 2020-07-28 19:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5581316041eab433446761c47e58d62f SHA-1: 5ee8787e3df679d7df668ec11bcc3eee8941d1f9 SHA-256: 7d123e046b4f2f218a5376f92ccaec5e1f758d9ef5d921c70da7acbde1f13dfe
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to redirector infrastructure. One such link, 'https://ttraff.cc/pify?keyword=hemoptysis+clinical+practice+guidelines', is flagged as malicious. The document's structure and the presence of numerous links suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier also strongly indicated maliciousness.

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.
  • 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=hemoptysis+clinical+practice+guidelines
    • http://files.agentsreferralnetwork.com/uploads/1/3/0/7/130738564/1954539.pdf
    • http://files.cassinsackett.com/uploads/1/3/0/8/130815017/sipibeviloguxupinara.pdf
    • http://files.poshdesignswholesale.com/uploads/1/3/0/8/130813860/mepifivejupudekunemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/70976836745.pdf
    • https://cdn.shopify.com/s/files/1/0439/9408/7582/files/suvemozewazij.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/watiguxivapiputebaran.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/fusisi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/4088810777.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/51346708813.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9898/files/jekadegikaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/88943857038.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/sutolujilisibekegujo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/84858962210.pdf
    • https://cdn.shopify.com/s/files/1/0431/4369/2445/files/40629864721.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b6e.bin
ba1e8e57d343d8b4187dc2695ecf98cee2f1e00b35321ba1ff955fc78142b95d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 5336 bytes
font_01_sfnt_off00014d7c.bin
920d3a4dd06f4bb099cb3b1249b0e1626e94ea9ca6235614e79643f57882bf14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7C 10528 bytes

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