Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ea6a4ef66f05c4…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 18:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a528bff47c8dae0ad4686cc0facbb09 SHA-1: 4978092b127800d969c44440ec150ae2da782cc7 SHA-256: f3ea6a4ef66f05c43062e9f3091dd323f454839be8bdbe786f7aac9afc47ec5e
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a primary link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting it is an 'electrolysis equations worksheet', likely a lure to encourage clicks on the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed for malicious redirection.

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.com/pify?keyword=electrolysis+equations+worksheet
    • http://files.jefferyedoherty.com/uploads/1/3/1/3/131380058/1610684.pdf
    • http://mosesub.stcatherineschurchlittlehampton.org/uploads/1/3/0/7/130776433/budolazifi_nodezedaviro_kosob.pdf
    • http://files.sarasotapaversealing.com/uploads/1/3/0/7/130738892/bajugivo.pdf
    • https://cdn.shopify.com/s/files/1/0461/4337/3480/files/simplicity_pattern_measurement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/aptitude_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/91373192918.pdf
    • https://cdn.shopify.com/s/files/1/0435/0246/9285/files/85568278549.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/47371776509.pdf
    • https://cdn.shopify.com/s/files/1/0430/3516/4835/files/glee_loser_like_me.pdf
    • https://cdn.shopify.com/s/files/1/0452/3635/5232/files/wachteln_brten.pdf
    • https://cdn.shopify.com/s/files/1/0434/8153/0534/files/social_entrepreneurship_ppt_templates.pdf
    • https://cdn.shopify.com/s/files/1/0433/7926/1590/files/vemobixiraduteledafofos.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/55902352084.pdf
    • https://cdn.shopify.com/s/files/1/0437/0461/5066/files/71872802066.pdf
    • https://cdn.shopify.com/s/files/1/0428/8200/7199/files/28710076854.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/jigoroxipew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/vizogekiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005552.bin
6ef8a25c55ffe7bf58d3043a4db807aa1c22be3cd226b1de28441fc1eefa4169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5552 5108 bytes
font_01_sfnt_off000066bf.bin
23412e0d851537a618356e80620db57e3cc9594e4f1f10b4db634eed70176b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BF 10212 bytes
font_02_sfnt_off00008963.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8963 4324 bytes

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