Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c07adb2aaff5199…

MALICIOUS

PDF

44.5 KB Created: 2020-08-11 20:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b525ae404a55e5c41a676c9dcb8fb30b SHA-1: 7131b8f46a3e64ab3bceee75d95ef7381b760cac SHA-256: 0c07adb2aaff5199738979e3809a6c04389fe7b6e2cc5f4b101a4992cb4271ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=accounts+receivable+supervisor+job+description+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to be an attempt to disguise the malicious links as a job description. The ML classifier also strongly indicated maliciousness.

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=accounts+receivable+supervisor+job+description+pdf
    • http://files.muscularinjuryspecialist.com/uploads/1/3/2/6/132681891/kixuki-tupiwadekisi-wibagat.pdf
    • http://wutuv.1860sciviliancelebration.com/uploads/1/3/1/6/131607240/fovugajirinu.pdf
    • http://files.laedgefilmawards.com/uploads/1/3/2/6/132695575/2eaa64983fc1045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7968/7574/files/coleman_powermate_parts.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/kupevutaxutabekamebosejaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/16741968193.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/3_day_split_workout_routine_for_mass.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/best_books_on_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/fesisovesoxix.pdf
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/jitisewomikaxurelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/makizukosudidaduravusip.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/nulajalabavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8325/files/ascending_and_descending_order_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1448/files/composicion_amalgama_dental.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/tilidomoritasoru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/vinifawutijefiv.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_off0000620a.bin
a1ce617b8730583a3dffe2026cbbfb189d6b86366173e857ca47a0d9e1f5d904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620A 5296 bytes
font_01_sfnt_off00007414.bin
3c3907d4a63e638313f39c258f3b7c0ff477654821e2bafe46e49561c60ed96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7414 10048 bytes
font_02_sfnt_off00009656.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9656 4324 bytes

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