Malicious PDF — malware analysis report

Static analysis result for SHA-256 0067b669738b6fa1…

MALICIOUS

PDF

47.5 KB Created: 2020-08-23 22:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d637bc22fa75f65e9e86d46f0527a2 SHA-1: 27bd1ba998b81f6f82cd4fd0a11e6166d3fe144d SHA-256: 0067b669738b6fa1533a2af8201799efccaa5f7c84cd89490b92105afbb823c7
190 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically designed to lure users with keywords like 'Wells Fargo mortgage assistance forms'. The document body, though heavily obfuscated, contains references to this malicious URL and benign-looking PDF files hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=wells+fargo+mortgage+assistance+forms
    • http://files.gvcabc.com/uploads/1/3/0/7/130775652/tenorageza_lewufixaxi.pdf
    • http://files.playittodaygames.com/uploads/1/3/0/7/130776864/bovemuzikazimepijo.pdf
    • http://files.digistitchcustomapparel.net/uploads/1/3/1/3/131398145/1790422.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/76590793878.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/26377289788.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/31598465372.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8537/files/zitek.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/jatakilegisoredowinivodi.pdf
    • https://cdn.shopify.com/s/files/1/0441/0369/6536/files/43190140305.pdf
    • https://cdn.shopify.com/s/files/1/0431/3710/6087/files/nikulakifenivejefuwo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1001/3853/files/korurokovaputegakibuxol.pdf
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/types_of_adverbs_worksheets_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/40718099563.pdf
    • https://cdn.shopify.com/s/files/1/0431/6708/8800/files/3152338715.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/88929850351.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e18.bin
be8843bdddcfde46d703b44afa417cdb465751b6299d5ce3411feab4295e9662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E18 5004 bytes
font_01_sfnt_off00007f02.bin
6de3180ea2228b167d46f6f2de5e5f19ef4c1b2985d9069865482069e33e4e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F02 10320 bytes
font_02_sfnt_off0000a253.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA253 4324 bytes

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