Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be4ba4bcf81b11b…

MALICIOUS

PDF

52.3 KB Created: 2020-08-20 10:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b495c8a5802425cfa5faa4991aba4ad0 SHA-1: 32a150ed67001fb82ea03d99c729d0a6945dad05 SHA-256: 6be4ba4bcf81b11b99b5916b52e39fd02d1642c9876023fa3879fad782adb487
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure (ttraff.cc). The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDFs, suggesting a link farm or redirection tactic. 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/pify?keyword=edward+snowden+memoir+pdf
    • http://gozipi.kscenvironmentalstudies.org/uploads/1/3/1/8/131871390/8110572.pdf
    • http://wifolivi.athenianenterprisesllc.com/uploads/1/3/1/0/131071041/lofaviku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/ad_free_android_games_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/wugebud.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/sutufaxabujozi.pdf
    • https://cdn.shopify.com/s/files/1/0454/3532/2526/files/acuerdos_de_san_andres_ezln.pdf
    • https://cdn.shopify.com/s/files/1/0462/4318/4794/files/lirumubufuforov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2848/files/42812090009.pdf
    • https://cdn.shopify.com/s/files/1/0437/7424/7069/files/19853428972.pdf
    • https://cdn.shopify.com/s/files/1/0446/2179/1395/files/pradeep_chemistry_book_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/how_to_save_a_twitter_gif.pdf
    • https://cdn.shopify.com/s/files/1/0439/1891/7787/files/wozavomaderevoponirezaked.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/mizogexarupizodifepajaw.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_off00009089.bin
26a5b7c694ecdc0df0f7d704285324364b8b5d988337e76736b03e7e3182714f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9089 5204 bytes
font_01_sfnt_off0000a23c.bin
08d224d7ef823ffc7df65768cb55e8590eaaf29b24bae8269cba561f1e875138
pdf-font-stream PDF embedded font (sfnt) at offset 0xA23C 10144 bytes