Malicious PDF — malware analysis report

Static analysis result for SHA-256 88edf5017fafb1b7…

MALICIOUS

PDF

37.5 KB Created: 2020-08-11 00:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa0b86831c887af2086156977262198b SHA-1: 8ed8d02a2c85d9ab9bcb6e740b1558ebc25b57e7 SHA-256: 88edf5017fafb1b73765b6705f851cb4a193131b551c228cbe0fa112a30957a5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are likely part of a link farm designed for SEO manipulation. One prominent URL, 'https://ttraff.ru/pify?keyword=convert+pdf+to+word+ocr+online+free', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains references to the same suspicious URL and benign-looking Shopify URLs, suggesting a lure to redirect users to malicious infrastructure.

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/pify?keyword=convert+pdf+to+word+ocr+online+free
    • http://files.thevillageallstars.org/uploads/1/3/1/0/131071067/xufelofewipur.pdf
    • http://gutifetub.pinningdownclouds.com/uploads/1/3/2/6/132681670/7803636.pdf
    • http://lixesu.lcorelca.org/uploads/1/3/2/7/132740353/lafilenu.pdf
    • http://detoluza.no-sewcrafts.com/uploads/1/3/0/8/130874601/1796214.pdf
    • http://files.vie-delequipmentsales.com/uploads/1/3/2/6/132681062/9721829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/64390995073.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2995/files/rubik_s_cube_yellow_cross.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/29160060989.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/clinical_virology_manual_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/84386099573.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0711/files/fatanoduzuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/29918869899.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/place_preposition_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/metafisica_aristoteles_garcia_yebra.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/magobusiriwolozun.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6141/files/90629067140.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_off000055ce.bin
24b7e3fd0e750f6850420d68a8470721288541260dc2e1726853f4fe8b3d2af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55CE 4816 bytes
font_01_sfnt_off00006658.bin
dd03726dbe07ebc6446c90f550078e5dc3d3eff0d4f01b2072e8a875b780957b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6658 10156 bytes

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