Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1b3da38c755cc5…

MALICIOUS

PDF

38.5 KB Created: 2020-08-29 23:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccc9e93250a505d0aae60320e542e29b SHA-1: 0e5fcdaf62cf8c70aa7d42fe2709a79506ed0551 SHA-256: 2a1b3da38c755cc53509ec8fb67629e939f0b99413e656279b9c5bbb35c4f7aa
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm, with numerous links hosted on Shopify, suggesting an attempt to create a large number of SEO-optimized pages. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be the distribution of malicious links disguised within a PDF document.

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=dictionary+of+pronunciation+norman+l
    • https://cdn.shopify.com/s/files/1/0433/9128/7452/files/filenona.pdf
    • https://cdn.shopify.com/s/files/1/0432/8446/3784/files/zemogilovubokaroxadorixiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17612659915.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puwojadudabub.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/94121253156.pdf
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/foggedftw2_trynd_spreadsheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e81fd44c89242d781c1bddc7448a2a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_440114f5513f4854b313b69758118795.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/minecraft_mods_1._8._3.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/navidilamekox.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000598f.bin
0f643024c4ffad28f79028ddc916fa975177abb781b403a950020bfd97dfec9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598F 5084 bytes
font_01_sfnt_off00006acf.bin
cbca103585dee92815619154ae6caaa79a8c00423c3f7a2b285867a64ff680e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACF 10272 bytes

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