Malicious PDF — malware analysis report

Static analysis result for SHA-256 c050564fe7580aa1…

MALICIOUS

PDF

46.6 KB Created: 2020-10-11 02:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e82079d8d920eca8c5ab553bce060f5d SHA-1: 6599af4cfbabace5e7cafa0a599e31f063662eec SHA-256: c050564fe7580aa1017aa2824f379f16f57997abdab3cf603f9b4fe93e366465
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=subaru+touch+up+paint+oem'. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its intended lure, but the sheer volume of suspicious links points to a malicious intent to redirect users to harmful 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/pify?keyword=subaru+touch+up+paint+oem In PDF document text
    • http://files.aureliakarwia.com/uploads/1/3/0/8/130873983/7179151.pdfIn PDF document text
    • http://vakonow.doublejoutfittersny.com/uploads/1/3/1/6/131606271/2717341.pdfIn PDF document text
    • http://wodura.illica.com/uploads/1/3/0/9/130970003/zabuvojivukafe-gidudad-tizol.pdfIn PDF document text
    • http://rexofupa.windsordoorsales.com/uploads/1/3/1/4/131453416/6251096.pdfIn PDF document text
    • http://suwupa.escondidowindowtintingpros.com/uploads/1/3/2/6/132695990/bapan-rajifef-dijabezorunoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9371b13c-0621-4047-969d-d152f1fb763c/67098072036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6b114d-684d-4365-9501-67b84a64f09d/11241220186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9926/6465/files/rooting_hormone_in_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4694/4416/files/probability_tree_dependent_events_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1062/1341/files/28418183612.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8352/5015/files/cuanto_mide_una_pulgada_en_mm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6079/7862/files/kenmore_induction_range_error_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4686/5576/files/acids_bases_and_salts_quiz_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9176/4414/files/salem_red_sox_schedule_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8516/0857/files/pathfinder_archer_build_fighter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8016/3229/files/harley_davidson_wallet_tri_fold.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C10 5204 bytes
SHA-256: 18ac1e53a1ed78e0c08c219b13c188a877f80ea683e186a453a7cdb19d580613
font_01_sfnt_off00007d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8E 14636 bytes
SHA-256: 6e22850a1864c021d6c2a660654eefbf10438d79a32fa809f3b136b28a2bbcd9

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