Malicious PDF — malware analysis report

Static analysis result for SHA-256 943e0b3023ce1c04…

MALICIOUS

PDF

41.0 KB Created: 2020-08-13 13:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df4d64f9dca19913971bce87b005feb9 SHA-1: 4274ff6da34d0213749a90e510d297962d79989b SHA-256: 943e0b3023ce1c04654570a906c26c15310896db201a7cb57f42aeadb21c1010
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.cc/wb?keyword=essentials%20of%20human%20anatomy%20and%20physiology%207th%20edition%20lab%20manual, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, also contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=essentials%20of%20human%20anatomy%20and%20physiology%207th%20edition%20lab%20manual
    • http://files.fortworthrowing.com/uploads/1/3/2/6/132696323/3116487.pdf
    • http://files.bournemouthoutriggercanoeclub.com/uploads/1/3/1/4/131437064/losesubexogomulareju.pdf
    • http://files.swinganoia.com/uploads/1/3/1/6/131607440/subarijonel-joluzira-mobubo-niwawigese.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/building_maintenance_engineer_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/42687657517.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/panizimugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/98682141869.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/belajar_coding_html.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/diy_laptop_stand.pdf
    • https://cdn.shopify.com/s/files/1/0431/9415/5169/files/calendario_2020_mexico_dias_festivos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/verulamenudabewad.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/baldor_motor_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/9959624768.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/wilogabamosuwedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/bimiguwafiwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6182/1083/files/29537400759.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006223.bin
60883f32e53f30865347793313354f83bf9dd1adfcd47bf786b00bb4c8085beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6223 5640 bytes
font_01_sfnt_off00007536.bin
5a0b4415b11b972cf13d04a1d5548052ceff56d35f57d00d76d2eb2fb16d609f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7536 9780 bytes

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