Malicious PDF — malware analysis report

Static analysis result for SHA-256 07abd263a8d9915e…

MALICIOUS

PDF

44.6 KB Created: 2020-08-10 12:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e207e86c4b71e69aff255288976beade SHA-1: 250732d44f6857e05decc11e87229bb4fec2e2dc SHA-256: 07abd263a8d9915e3fb3b4e41643c5ff2de428b0d288ae622ed322e00cc1d2a9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains text suggesting a lure related to a book title, which is likely a pretext to disguise the malicious links. No scripts were extracted, but the presence of a malicious redirector and a link farm indicates an attempt to lead users to harmful content.

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.com/pify?keyword=headway+beginner+student+s+book+fourth+edition+pdf
    • http://nilaji.mtcarmelchristianacademy.org/uploads/1/3/1/4/131407089/76c3c2c.pdf
    • http://mimulajiv.peterandpaulapixie.com/uploads/1/3/0/7/130740178/1034114.pdf
    • http://sevuv.holytrinityucc.com/uploads/1/3/2/6/132681352/8810aba1cd569.pdf
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/openssl_certification_authority.pdf
    • https://cdn.shopify.com/s/files/1/0430/0524/7647/files/77933125228.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/tetemuxedabojawivise.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/80713170133.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/4658629884.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/mutufubive.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3345/files/78794636565.pdf
    • https://cdn.shopify.com/s/files/1/0430/7081/6407/files/folutawomileza.pdf
    • https://cdn.shopify.com/s/files/1/0428/7977/8979/files/60386156675.pdf
    • https://cdn.shopify.com/s/files/1/0437/7464/0286/files/understanding_pathophysiology_6th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/tanekipigos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2013/files/driver_san_francisco_cars_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/afrontamiento_defensivo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/bisunoliwetojimus.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_off0000617c.bin
17e5c626f1115c2c37932721dbcdad1c2406782ae9533a83db7c3e039d8b9605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 5512 bytes
font_01_sfnt_off00007439.bin
394cd9e820696bbfc50cf9c43d5b7fe244fd360eec552f64398026f71279811e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7439 10120 bytes
font_02_sfnt_off000096cc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96CC 4324 bytes

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