Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f0cca05021fc80…

MALICIOUS

PDF

43.5 KB Created: 2020-08-02 12:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad482adcebfd226f21b8a31944537ef8 SHA-1: 76b70787044be0296e0b83b1307c1e904120b91a SHA-256: 78f0cca05021fc8027838244e6c13a7568a2ca866e2944a641e7848beacea5e4
182 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified as a redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. The presence of numerous external PDF links also indicates a link farm, potentially for SEO manipulation or to host further malicious content.

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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=nerb+dse+study+guide
    • http://files.dundassportsmemorabilia.com/uploads/1/3/0/7/130775490/sogawesanijero-kugitivutabaz-feritojugudega-kewemumunatorok.pdf
    • http://files.titandebate.com/uploads/1/3/2/6/132695388/novigoperer.pdf
    • http://files.knowledgeenriched.com/uploads/1/3/1/0/131070362/kanevu_domegeket_fiviw.pdf
    • http://files.lisascakelollies.com/uploads/1/3/0/9/130968912/kujuralon-vejujix-lulesatu.pdf
    • http://files.kariccohairdesign.com/uploads/1/3/2/6/132680905/lanegagixulovufuviv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/22348039810.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/tuduvapemodijug.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/kavagowobobuja.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3767/files/bewibatuzekawinuturomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/87196274797.pdf
    • https://cdn.shopify.com/s/files/1/0441/1306/8184/files/sajonofodapigusagowiwimek.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/42518145321.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/18846520536.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/sijexusivezazelegap.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5990/files/pidovalixorewifitoraguru.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/23062758230.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/arch_linux_viewer.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9799/files/42001610215.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_off00006b89.bin
6eddbdef6f3533f275ef9195c9350b3bbba8910931ceed85d9163f5cb09fed90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B89 4964 bytes
font_01_sfnt_off00007c86.bin
987353d2ce26629fce1bc854719f20864b293e2764ce7f4aa5e99f58fdfac253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C86 10612 bytes

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