Malicious PDF — malware analysis report

Static analysis result for SHA-256 01afa46d18528771…

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 09:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88e025d314067ddca2e3b5640b7d5dc2 SHA-1: 8d5499151fc31a36fcd8c09a207ca9c974688877 SHA-256: 01afa46d185287710848404e384e6ed248ee45548953ec69c5c29e73fed1a911
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1204.002 Malicious Link

This PDF file contains numerous embedded links, with one specifically pointing to a redirector URL associated with USPS complaints. The ML classifier and critical heuristic firings indicate malicious intent, likely for phishing or a scam. The document body, though heavily obfuscated, also contains the suspicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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/wix?keyword=usps+complaints+department
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_74faa0f4eac745aca4a6d1b746ea9940.pdf
    • https://static.usrfiles.com/ugd/b8c837_25e675717b5249338d44d858e42fe527.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad22e395b6d34194bcdaf4fa36e1432c.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f0ef534d9c14e938ebf0f527d2bec38.pdf
    • https://static.usrfiles.com/ugd/b8c837_b224d8e76dea45cda904ec41700dd946.pdf
    • https://static.usrfiles.com/ugd/b8c837_93ba3da61f764956aa760ba5357b868c.pdf
    • https://static.usrfiles.com/ugd/b8c837_59d6a22c28e24ac4a61b320cde793385.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e904775cefb4412b93ad8db286da3b2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufotiniponekurek.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/xuditapefusarosuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/16304157265.pdf
    • https://cdn.shopify.com/s/files/1/0439/1642/7419/files/rokisibejikigixabefal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/mopituzexijajevalosubij.pdf
    • https://cdn.shopify.com/s/files/1/0445/3515/2804/files/hazmat_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/pevobunoroxopojotididisal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/dixubunadoxavuwakasobiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/mafakof.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_off00006655.bin
7d43daceee0a5d4049e087c7a1b1a54bbaf95a97946620cee3932e256e4a1f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6655 5212 bytes
font_01_sfnt_off000077e9.bin
31af8e7df8b5d87909aac2b01d04ec35989f2632df650cfa68cf5f8ce3379578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E9 10520 bytes

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