Malicious PDF — malware analysis report

Static analysis result for SHA-256 df34a1ad6839131d…

MALICIOUS

PDF

41.7 KB Created: 2020-08-05 10:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fe13be970de5cef780964bd77249ea2 SHA-1: fd80f1210af38f529b1d9e8b5edf40675dabc983 SHA-256: df34a1ad6839131d5f3075b353eb1bcb4eb15a3e0ec1b9a9f151694bd7310078
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The primary malicious URL is https://ttraff.cc/pify?keyword=shortcut+formula+of+maths+for+competitive+exams+pdf, which is likely used to redirect users to a malicious payload. The document body, though heavily obfuscated, contains this URL and other links that appear to be part of a SEO spam campaign.

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/pify?keyword=shortcut+formula+of+maths+for+competitive+exams+pdf
    • http://files.citizens-medicare.com/uploads/1/3/1/8/131856715/84789e320d7.pdf
    • http://files.burkettnesterracecars.com/uploads/1/3/1/4/131407102/boreju.pdf
    • http://files.dandelionridgefarmky.com/uploads/1/3/2/7/132741352/paxevif.pdf
    • http://files.candacesam.com/uploads/1/3/1/1/131164027/misexalupip.pdf
    • http://xosanejit.carlabrooksphotography.com/uploads/1/3/2/8/132816202/xerejukez.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/wagigigokodumenanuxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/bobcat_753_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/bajusabemofiwedomupifag.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4488/files/isee_the_light_tangled_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/tisax.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/88801900924.pdf
    • https://cdn.shopify.com/s/files/1/0428/2220/5607/files/cardiopulmonary_physical_therapy_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/77076221210.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/60012225176.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4246/files/pepepugosomax.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/13388799722.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/vudapobeduwalifer.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_off00006398.bin
1f064a09144a2b5b401d2930f2dc9bb1b4cb189fa436f039773e3d8e3ebbd5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6398 5628 bytes
font_01_sfnt_off00007698.bin
ff6de732b6c6067ceee503842697538f14a3cb594a1194d75ac959676b621c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7698 10132 bytes

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