Malicious PDF — malware analysis report

Static analysis result for SHA-256 773c60c12e680711…

MALICIOUS

PDF

37.9 KB Created: 2020-08-11 22:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 859f43b5d0a481cf4d56867878715e5b SHA-1: ab10995601e64fddf0430c154feeb196c3827986 SHA-256: 773c60c12e680711b73d42d4d0077e7b66f5720f1799f6613533af7bc74a2c7c
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 a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to malicious infrastructure, likely as a first step in a phishing or malware delivery chain.

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=maniac+magee+test+pdf
    • http://legovirir.adventurefictionforever.com/uploads/1/3/1/4/131483281/cdef7e93fd1a42e.pdf
    • http://files.skidderking.com/uploads/1/3/1/6/131606789/dd2c057.pdf
    • http://files.aokifooddreams.com/uploads/1/3/1/4/131410299/minol_tudivebu_sozefole_fupad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/lisiwukanor.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/5539892125.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/42679881428.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/differential_calculus_examples.pdf
    • https://cdn.shopify.com/s/files/1/0437/3164/8663/files/barbarian_wrath_of_the_wastes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/59323417044.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/laguribimunuvemusupekar.pdf
    • https://cdn.shopify.com/s/files/1/0447/1137/9097/files/boss_me_80_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/peso_corporal_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/18666961134.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/768674204.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7637/files/beyond_compare_mac.pdf
    • https://cdn.shopify.com/s/files/1/0435/7318/2625/files/xirasimewusuvino.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_off0000569d.bin
e7e8d150be19b5e7e76be38fc63ea0f9b5ded7dec87a998789148fc1eb2dd874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x569D 5352 bytes
font_01_sfnt_off000068c4.bin
ec211c6334763894a7dd67d337aa197e62bcd08e074f3ec6fb79e00fce3d4233		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C4 10012 bytes

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