Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2769ff473fcdb8…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 08:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4f060094e4854952da7fab2b3cc4524 SHA-1: ed41440ca3702180ca0c2a384d13a8e41d2c3604 SHA-256: 7a2769ff473fcdb8bda5f58ae18824299aebe37506404ebb92a061ea349252d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning attack. One of the primary links, 'https://ttraff.cc/wix?keyword=arco+gotico+de+gysi', is flagged as a malicious redirector, suggesting the ultimate goal is to lead the user to a malicious site or download. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=arco+gotico+de+gysi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/3303695529.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/5_canons_of_rhetoric.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/votoramuzo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/wow_elemental_shaman_guide_7._1._5.pdf
    • https://cdn.shopify.com/s/files/1/0436/8452/8281/files/ben_10_galactic_champions_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/78451979018.pdf
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/47591464430.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/2011726658.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/alternative_energy_sources_reading_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0294/files/peta_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0438/5190/7237/files/55631681984.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/sututasomulojixanit.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/buluromelanusef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/30985157263.pdf
    • https://cdn.shopify.com/s/files/1/0431/2609/6036/files/fovoja.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_off000060df.bin
b0ed0a3d325f57aeef49990bcc40f94ffed80c7b078387c2de7ca74893052380
pdf-font-stream PDF embedded font (sfnt) at offset 0x60DF 4956 bytes
font_01_sfnt_off000071d0.bin
610f45c2fdc96d0362901776ab7859e95405ddac2a8c770b75548f53c74a9c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D0 10792 bytes