Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fc5f6a4037bc59…

MALICIOUS

PDF

50.5 KB Created: 2020-08-13 22:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b2d5714ba5c8e68182864545390828 SHA-1: 44bd13a483162b76d18b328d8012936c838c0afb SHA-256: 05fc5f6a4037bc59941feb0cf78f7a622352ad26e991244fd81c858c61113050
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service designed for SEO manipulation and potentially distributing malware. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests a link farm or spamming operation.

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.com/pify?keyword=bihar+tet+online+form+2019+sarkari+result
    • http://files.classwithheise.com/uploads/1/3/0/7/130740211/f2d75b.pdf
    • http://files.goodbless.us/uploads/1/3/1/4/131438471/a775c0ea78ddc57.pdf
    • http://files.unityphilly.org/uploads/1/3/0/8/130873830/kowiwidiluk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/pdf_to_word_macedonian.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/deled_assignment_front_page.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7177/files/customary_law_act_botswana.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/47027866383.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/altiplanicie_pulquera.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/converso_fahrenheit_para_celsius.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/distressed_debt_analysis_strategies_for_speculative_investors.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/nixetomuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/3d_world_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/faninapobo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/wufiforipebowugidogodixuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/6563/7019/files/fletching_calc_rs3.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_off00007b72.bin
d4c55f3be0f73b2f9363d9ece5c2cc889a8dbfaed1d919bd3e745b89587bd444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B72 5604 bytes
font_01_sfnt_off00008e4a.bin
e83ca8df56dd48bfd4563cb4d0704632e5e8a4b7ff01b58de52589e155216421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4A 15216 bytes

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