Malicious PDF — malware analysis report

Static analysis result for SHA-256 3419cf08db85de88…

MALICIOUS

PDF

41.6 KB Created: 2020-08-15 01:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d4b65e2b88a21592b1df4791be8fb3e SHA-1: 262fae4ceb33b1c6435d0654257cb16e8c8992bf SHA-256: 3419cf08db85de88321989720985deaae5f555c897b33deb33c48da519560f64
194 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body and embedded links suggest a lure to download further content, likely malicious. The presence of multiple PDF links, many pointing to Shopify, indicates a link farm strategy to obscure the ultimate destination.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/wb?keyword=philomena%20book%20pdf
    • http://files.russlevin.com/uploads/1/3/1/3/131378776/wifoliti.pdf
    • http://dugoko.launidadlatina.net/uploads/1/3/1/3/131379290/5299579.pdf
    • http://jisidesi.rhbconstructorainmobiliariasrl.com/uploads/1/3/1/3/131380429/gavefamemelazo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/rijimug.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/8897519441.pdf
    • https://cdn.shopify.com/s/files/1/0432/6119/8500/files/bavijefaretefiriperep.pdf
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/bulupakojevifepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/56345820192.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/cerere_inmatriculare_auto_bucuresti.pdf
    • https://cdn.shopify.com/s/files/1/0431/4955/7917/files/pdf_file_creator_software_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/rubajuwodoxidegore.pdf
    • https://cdn.shopify.com/s/files/1/0448/4582/6210/files/receipt_book_walmart.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_off000065f3.bin
6a26f75369e3b13111d86364def3845a07809e5f7837ab72bf2dd0d528e07351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F3 5212 bytes
font_01_sfnt_off00007782.bin
d778a3ee890b471bc8d200980088b32ead5aab4bd5a8a49de5429ac08a9534a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7782 10120 bytes

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