Malicious PDF — malware analysis report

Static analysis result for SHA-256 78539fbe4c369e1d…

MALICIOUS

PDF

39.5 KB Created: 2020-08-20 20:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61c7ef0079aaff1f1ecb993dbad0ea14 SHA-1: 592c2cfd205d3edfc9e270fd5e7b5b884ea2ec95 SHA-256: 78539fbe4c369e1df716e771ac141957b83f4cecadd05b1673fcba9279d811b7
174 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially garbled, includes text related to 'Google account settings' and a URL that appears to be part of a link farm. The presence of multiple PDF links and a critical heuristic firing for malicious redirector links strongly suggests a phishing or redirection attempt.

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.
  • 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) 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/pify?keyword=google+account+settings+android+phone
    • http://vejex.livelively.co.nz/uploads/1/3/1/3/131379698/jorinofogetikab_fafapagexalupe_demusugurebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/avoiding_the_use_of_chemical_pesticides.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/lopupezezivevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/tosipumagareru.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0803/files/jerubajojodip.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3671/files/biology_form_4_chapter_5_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/76881681481.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5789/files/75724435742.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/8841217631.pdf
    • https://cdn.shopify.com/s/files/1/0429/6808/8742/files/crits_apocryphes_chrtiens.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.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_off00005ca6.bin
48ee0b6b582800558e6c6b05feee7858fb50f09f3f9d2ef81210e2eb33dc3655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 5364 bytes
font_01_sfnt_off00006ee0.bin
0a1f6db88f5da189de1465b82a8764020fcba6e9401db4060d5bddd661e018c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE0 10044 bytes

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