Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1ca5991ca78027…

MALICIOUS

PDF

48.3 KB Created: 2020-08-05 08:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ee4758c212b2e50c1bf72ed9235d23e SHA-1: 5a9c4d809add9527ef5afc38e2f3137d8ef98af6 SHA-256: 5b1ca5991ca780278440a1ad5657bea9217e75166e36d7501b456f13f5756b72
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though partially corrupted, contains the same malicious URL, suggesting a lure to download or view content hosted on potentially compromised or malicious infrastructure. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=mca+cet+result+2020+pdf+download
    • http://files.nadinenapear.com/uploads/1/3/1/3/131379706/ce56e3239374e9.pdf
    • http://files.pinkturtledesigns.co.uk/uploads/1/3/0/7/130776368/78a451b1d.pdf
    • http://files.okto8online.com/uploads/1/3/0/7/130776682/juluko-zubofog.pdf
    • http://ririxulo.highdesertptcortez.com/uploads/1/3/1/8/131871721/4483871.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/86256545354.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/vuxububobumebewuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/xalupuzolokijibikir.pdf
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/xuvufuwurujusujow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9177/files/algebra_1_workbook_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7407/6315/files/41229649365.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/94660335105.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/questions_on_rational_numbers_for_class_8_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/sajake.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/76642817097.pdf
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/gafijifipez.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/sikujovikurogud.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/mawozapojotiwabepu.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_off0000707a.bin
b732013b698d5caa0ee45eca20c0078aa83bfaaa025345c03f8c7fa306e17b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707A 5352 bytes
font_01_sfnt_off000082d5.bin
4f426b019c4bd2b9bfcc66c96373889781dce3c24aba76fee9f02cad08b6cb7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D5 10304 bytes
font_02_sfnt_off0000a61e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA61E 4324 bytes

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