Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f1976bb9fe0ea3…

MALICIOUS

PDF

50.4 KB Created: 2020-08-24 11:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7afde64b8a4765298e425250632a46 SHA-1: c9656d1ddceeb69fe9d8ad05e0c3e9e5837b65b0 SHA-256: 03f1976bb9fe0ea3e04cb4ae34ad38c1a6cd812c454f6be10f4ca9c1f72bcbcb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Impetus crossword answer' and references the wkhtmltopdf tool, suggesting a lure to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=impetus+crossword+answer
    • http://bifubusok.tpccommunicationsaustin.com/uploads/1/3/0/7/130739892/ropag_peledem_bijaxaroxadowa.pdf
    • http://sutotut.carolgarbodenmurray.com/uploads/1/3/2/7/132740900/cdffa3aad.pdf
    • http://files.crescentsecurities.in/uploads/1/3/0/9/130969986/mojulu-zisuwi.pdf
    • http://files.jjeffreymesserole.com/uploads/1/3/1/3/131384018/f3faf9c41e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/8034611105.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/tuvonisa.pdf
    • https://cdn.shopify.com/s/files/1/0447/8982/5687/files/dc_young_fly_age.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/77388135625.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/automata_theory_objective_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/apc_back_ups_xs_1500_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1178/files/78308874438.pdf
    • https://cdn.shopify.com/s/files/1/0445/5186/4484/files/3263047627.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5079/files/30667934995.pdf
    • https://cdn.shopify.com/s/files/1/0463/2657/9362/files/honda_civic_hatchback_2000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/what_is_ac_current_and_dc_current.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_off00007a5d.bin
3f0f6e171ee821a5dba1858018192e97be91c67f3a6ddebda791f3950b1be8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5D 5052 bytes
font_01_sfnt_off00008b72.bin
28374cd0e2986d5aed83492ad259aaefa186e81b56f2d444827ff032048fae76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B72 10192 bytes
font_02_sfnt_off0000ae4c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4C 4324 bytes

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