Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e934bcafab657d5…

MALICIOUS

PDF

51.0 KB Created: 2020-08-09 13:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7a3b7cb1ee67c648c1d6fb160d76792 SHA-1: 9201070c2dc2ecb7fa16d7d8f6f9b83106c1c734 SHA-256: 3e934bcafab657d55eb7ef74d14978f5674794fb8731dffa6379cf67281242db
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bursite+no+ombro+fisioterapia+pdf.

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/pify?keyword=bursite+no+ombro+fisioterapia+pdf
    • http://files.resfeberrecollections.com/uploads/1/3/2/6/132681985/e9c2d21f8c.pdf
    • http://files.youthactionmemphis.com/uploads/1/3/1/4/131407695/zutigakoxisi-kowokidido.pdf
    • http://rojetod.stjohnofgod.net/uploads/1/3/0/7/130776483/lofokilasewipa_wigama.pdf
    • http://files.trchirowellness.com/uploads/1/3/0/7/130738572/40393b6.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/62869420781.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9644/files/cancionero_de_zambas_para_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/boxeluruf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/mimumewovibox.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/anchoring_script_for_school_function.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/mimesis_auerbach_polski.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/kinuluvaferajaxoziwibo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/xulubijenifum.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/gesuxojiwafeditafetegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/pisobomovamub.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/80994577298.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2733/files/walutotogalawanad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2428/4824/files/pseudomonas_aeruginosa_antibiotic_resistance.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a59.bin
7e945c7e589e38ec60203a40d67c3e566a81d361d23afaa67c98b026a9530aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A59 5344 bytes
font_01_sfnt_off00009c63.bin
f32307850ed353f528ac136bac4952445978004eca51fff9dea104f7b52598e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C63 10072 bytes

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