Malicious PDF — malware analysis report

Static analysis result for SHA-256 874d42d316670b3c…

MALICIOUS

PDF

36.2 KB Created: 2020-08-11 14:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bdb1d108d958eb1c2e54a9e9f477af0 SHA-1: 14ae3fb02ccf61a18cae57292065cdd50714d991 SHA-256: 874d42d316670b3c12be53dfbbc6ee248de606815e6242a4d5ed38601041fa1a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a reference to the same malicious URL. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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=data+analysis+in+stata+pdf
    • http://files.fbccrescentcity.org/uploads/1/3/1/6/131606605/6dc36d9.pdf
    • http://files.liberato.us/uploads/1/3/1/4/131412290/9a6944c.pdf
    • http://davoko.h2020-tutorial.net/uploads/1/3/1/4/131407406/ronupe.pdf
    • http://deguna.sewitschorke.com/uploads/1/3/1/3/131380485/fofoto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9218/1145/files/98519681864.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/pc_jain_paleontology.pdf
    • https://cdn.shopify.com/s/files/1/0436/9429/3142/files/2085346450.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/86867740892.pdf
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/48622844574.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/tabupazelefakutude.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/27188364091.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/74251612053.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/metastase_ossea.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/sasutenilak.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/80762771810.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0540/files/boschveld_chickens.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/kusovozafajexemow.pdf
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/95185519669.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050f2.bin
b4ade349a8ff73568bb74ac4f5564b016d94d70928086a3ea692b83864bc3310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F2 5040 bytes
font_01_sfnt_off00006239.bin
ec6992cc3b093d0c588b5b57ae5813833426206cc84b6a83d82d6092f3f9b0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6239 9860 bytes

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