Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b7c22b0a40dd1e…

MALICIOUS

PDF

36.9 KB Created: 2020-08-30 15:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23caaf27696e141bd0fba0b8942ee7bb SHA-1: 14ae5b743595347679bc50b3d32aafdec6934fea SHA-256: 73b7c22b0a40dd1ee2751749f4f7c40d978e24d976a3bd4e7c344bbe19bf43af
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. It also features a large number of embedded links, many pointing to Shopify, suggesting a link farm for SEO manipulation. The document body, though heavily obfuscated, contains the malicious URL, indicating an attempt to disguise it as a legitimate download link.

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/wix?keyword=fundamentals+of+vehicle+dynamics+gillespie+pdf+download+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/wivaxibuded.pdf
    • https://cdn.shopify.com/s/files/1/0430/6088/7705/files/91711876670.pdf
    • https://cdn.shopify.com/s/files/1/0438/5754/3328/files/79829319358.pdf
    • https://cdn.shopify.com/s/files/1/0438/8959/0427/files/80776410052.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/sunexubelojuroj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/blue_is_the_warmest_color_graphic_novel_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0462/1870/7098/files/46144537775.pdf
    • https://cdn.shopify.com/s/files/1/0438/1986/0125/files/synonyms_and_antonyms_for_ssc_mts.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/mimasutapile.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/dupekofefekefuk.pdf
    • https://static.usrfiles.com/ugd/4b68be_fc642a620cba4a94b170b984e6921185.pdf
    • https://static.usrfiles.com/ugd/b8c837_643fd96829174a5bada6054e7027b46e.pdf
    • https://static.usrfiles.com/ugd/80c1db_80f54b442e02418da8dacbf4c307d981.pdf
    • https://static.usrfiles.com/ugd/80c1db_8d29413773b2457ea9708cf3d387cbb3.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_off000043ee.bin
f4bdf738f68950fc5ff4a933b05720daaa7693b613be871b36563840a46195dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43EE 5660 bytes
font_01_sfnt_off0000571b.bin
26c0b7b66cb3ba274ff79ca5403236ad021c25911d31c66630254d997726ae59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x571B 9604 bytes
font_02_sfnt_off00007805.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7805 4324 bytes

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