Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5d8fd480617e7c…

MALICIOUS

PDF

40.7 KB Created: 2020-09-29 09:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9850ccdf69965bb93d9ef7c21f77432c SHA-1: 1d37b63b177a2bf231a5a5d21188a40370fdf2a6 SHA-256: 0c5d8fd480617e7c2b2942e742bb02812905ddc92d24ab1284dfc2a14b4190cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and link farms, indicating a malicious intent to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://ggtraff.ru/mozel?keyword=academic+reading+practice+pdf, which is likely used for phishing or malware distribution.

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://ggtraff.ru/mozel?keyword=academic+reading+practice+pdf
    • https://site-1036644.mozfiles.com/files/1036644/pikamiretimefaduka.pdf
    • https://site-1036862.mozfiles.com/files/1036862/24324790334.pdf
    • https://site-1036679.mozfiles.com/files/1036679/89308256802.pdf
    • https://site-1037238.mozfiles.com/files/1037238/52227505824.pdf
    • http://files.diegojmurphy.com/uploads/1/3/1/6/131636834/mipad-pizerakosage.pdf
    • http://files.missinginamericaproductions.net/uploads/1/3/1/3/131381067/b0f999.pdf
    • http://files.franklin20.org/uploads/1/3/1/6/131607810/jujififa.pdf
    • http://files.leadagency.org/uploads/1/3/2/6/132695663/wupove.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/9323/0498/files/ramosugajebovisoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/posterior_circulation_stroke.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/43381715455.pdf
    • https://cdn.shopify.com/s/files/1/0430/0265/8979/files/bezopigun.pdf
    • https://cdn.shopify.com/s/files/1/0483/4741/4691/files/44191580445.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_off0000616f.bin
88a4bace53b9a8fb377020d2ab21c52802dba35347c55a94fbdc3e92a9522402
pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 5256 bytes
font_01_sfnt_off00007343.bin
8f0e3a2a90c5d41fe2fcc4c8e3c61b89cce4876eb30f9cc11c22f1fb7954ea5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7343 10308 bytes