Malicious PDF — malware analysis report

Static analysis result for SHA-256 e206d4dc44b7eed1…

MALICIOUS

PDF

38.6 KB Created: 2020-08-22 21:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e9ff720d3e9423adc50f2b6542a3e0 SHA-1: bd668148b3eee40550f3ee15765a5f0b258b6fc2 SHA-256: e206d4dc44b7eed111cfb0c33a049eab592fa3a31df905670c1a7c7289c0594b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'guidestar charity check api' and the malicious URL, suggesting a phishing or scam lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=guidestar+charity+check+api
    • http://files.manitobaarteducation.com/uploads/1/3/1/3/131383943/4c2156bf772be.pdf
    • http://bososetat.dewaynebryant.com/uploads/1/3/1/4/131406286/b3479bd902971.pdf
    • http://files.greatscottideas.com/uploads/1/3/1/3/131398097/da2b196a7d.pdf
    • http://files.slavelakepokerrun.com/uploads/1/3/1/4/131453679/retidovalulab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/4002/files/27808786198.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/15798139380.pdf
    • https://cdn.shopify.com/s/files/1/0430/4896/0151/files/viporetak.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/6625538686.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/22263920566.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/calendrio_agosto_2020_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/lubokikaposigapurog.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/22023417084.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/assessment_purpose.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/vadevirakod.pdf
    • https://cdn.shopify.com/s/files/1/0428/4969/7959/files/103570120.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5766/files/sebofubaxiwala.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/55998945743.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/xasakawavozufigezubeza.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/kadinibejegi.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_off000057bd.bin
02e26b26c3584ae80becf46fcf63d510771661007dd9bc5dee376177dca10b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57BD 5324 bytes
font_01_sfnt_off000069d8.bin
f985cfc2053b286dd98fdd39b272b8a2dbe3136a58720e6806000137f74f4d51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D8 10492 bytes

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