Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66d16975f46a334…

MALICIOUS

PDF

37.9 KB Created: 2020-08-18 16:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0a283a182fa070cb415be0e1fb9e40 SHA-1: e967a0659b6fff2254c25fbf7e637c308494b1c3 SHA-256: b66d16975f46a3349c54909c15112b4e0f9a371b610b85703dcd2cf52b8015f8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users into downloading further malicious content. The document body, though heavily obfuscated, contains the target URL and appears to be part of a link farm strategy to improve search engine ranking for malicious content. The ML classifier 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=assessing+quality+of+financial+reporting+pdf
    • http://favik.honeycreekgoldendoodles.com/uploads/1/3/1/8/131856917/baxaxun-kasevelilobono-zidagexatumanix-najifuwu.pdf
    • http://files.ansonexresources.com/uploads/1/3/0/8/130874073/21f9292d261118c.pdf
    • http://files.parksidehighschoolfootball.com/uploads/1/3/1/1/131163666/dfbcc26.pdf
    • http://pevuge.welcomehomebywendy.com/uploads/1/3/0/7/130739873/zupavavomarewetekub.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7189/files/syndrome_de_peter_pan.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/wuzeximakelonekugosi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/broodmother_dota_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/what_is_com._ebay._carrier.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/dopitakufisatotiwuwetogib.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6471/files/limpieza_de_sangre_libro.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/zadolenaxenixufakawa.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/69954900919.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/annotated_bibliography_apa_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/33397295272.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/majelabevitamigexowoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/ffxiv_blacksmith_guide.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_off0000550c.bin
db991f0db536a372806e3f40361177337c242193ce1355f175634462c5f7fc15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550C 5540 bytes
font_01_sfnt_off000067ea.bin
9289d988b79911e3ca3af38d1e88fa2c4f935dccbffcca43ce5a3eace9fd9654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EA 10192 bytes

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