Malicious PDF — malware analysis report

Static analysis result for SHA-256 790200cf6a6442f0…

MALICIOUS

PDF

43.9 KB Created: 2020-08-29 15:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bb809c7ca7f0d978da56aeb3c8f29aa SHA-1: c62d6df5befcdfbc1d5ecf50cb442caa0b96d792 SHA-256: 790200cf6a6442f03293384f75f2428ae73938102c846aa130a8c2ac98cd629d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to benign content, but one critical link directs to a known malicious redirector. This suggests an attempt to manipulate search engine results or to obscure the true destination of malicious traffic. The ML classifier strongly indicates malicious intent.

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=carpal+tunnel+release+surgery+success+rate
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_17772981c6da43f3936d302466e8daf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_04c8d2ed750348cc964112c5802ceda1.pdf
    • https://static.usrfiles.com/ugd/b8c837_283188c811c942d19e284eda39a8c6a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b5dc8a808694101a998a10af16fb305.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f18b93e00c5441d98dc47483d6ac28a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fde0e5f9ecf94f0f8fa19f126ef7d74a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e36fb5fe9e074d02bd5680be6ef6f5ae.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/deruwopilawulogo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6789/0069/files/81418701790.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/aggravation_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0435/9841/3987/files/diablo_3_enchantress.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/funevibuposedeler.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/27068215334.pdf
    • https://cdn.shopify.com/s/files/1/0434/4519/0821/files/campbell_ap_biology_9th_edition_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/moduzibupazokemekowi.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_off00006e86.bin
ccdd55e2b99dda8037306f743ca5f4b623293de990fa41e95d79b95665d6f323
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E86 5108 bytes
font_01_sfnt_off00008003.bin
ceb1775746c1058a765102c2329e00b128d75e5d4eaa205b717dab4a5e753426
pdf-font-stream PDF embedded font (sfnt) at offset 0x8003 10304 bytes