Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af56fefebc57aa9…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 07:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a1dc247d21244c7628382be3e89b640 SHA-1: acadb0bfeabac3dc0cec6ddcae9345e1a9c815a2 SHA-256: 0af56fefebc57aa98d9c77f8704ce912f6dd30eb7cc1eda31b8d8861c2ab2f10
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text suggesting it is a 'college application checklist', likely a lure. The presence of numerous external PDF links further indicates a link farm designed to host malicious content or redirect users to malicious 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.ru/wix?keyword=college+application+checklist+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_24841f9d180540919a1375c8fd60701a.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_f24c2230be3c4e899383c53448f1e897.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2f540c36f1c48febaffc0d2ab13633a.pdf
    • https://static.usrfiles.com/ugd/003b86_1f3604d69b334c8dbd840c9a11c01caa.pdf
    • https://static.usrfiles.com/ugd/822ecd_36facd617f2f4931ab482cf3bdf527b9.pdf
    • https://static.usrfiles.com/ugd/8b97dd_7fcdf9d928ef46429c079453f48018b4.pdf
    • https://static.usrfiles.com/ugd/22bf55_0f57a21c37fd40b891354c3d8c023acf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/wurojezovidi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/16300648110.pdf
    • https://cdn.shopify.com/s/files/1/0432/6293/5200/files/xejupa.pdf
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/14635952895.pdf
    • https://cdn.shopify.com/s/files/1/0429/1067/9203/files/16886203829.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0899/files/rumuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/83389774553.pdf
    • https://cdn.shopify.com/s/files/1/0431/6079/7333/files/gone_fishing_guide_service_richland_chambers.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_off0000658c.bin
448ce2e8d67dcd761321a3891956f111320572eab4d229b8c8113bd71bd46d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658C 5196 bytes
font_01_sfnt_off00007734.bin
545f1d7c3cdd5076e8a62e9bce15e85e56e9a1e9a3f3be58bfb420e6ad202482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7734 10044 bytes
font_02_sfnt_off0000997d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x997D 4324 bytes

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