Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71f08a804e947be…

MALICIOUS

PDF

42.9 KB Created: 2020-10-31 12:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c13ec3439b01549ca35d4d9d587789e9 SHA-1: 1a99a0ac986e7f9252e9a315cb225c6b549df518 SHA-256: b71f08a804e947be421925ecc17f55dc850877f3740eec80cfbed6a720afcacb
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/aws?keyword=the+great+gatsby+answers+chapter+1`. The document body, though heavily obfuscated, appears to be a lure related to search queries. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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://cctraff.ru/aws?keyword=the+great+gatsby+answers+chapter+1
    • https://cdn-cms.f-static.net/uploads/4417988/normal_5f95d6db953a2.pdf
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f87621fcbf93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ruzumeb/3424699347.pdf
    • https://uploads.strikinglycdn.com/files/5057aa7a-576f-4cc3-a6f7-e580e28f1fec/origins_and_history_of_consciousness.pdf
    • https://s3.amazonaws.com/bejeseja/miller_heiman_strategic_selling_ppt.pdf
    • https://s3.amazonaws.com/warapagefasovi/everstart_powersport_battery_charging_instructions.pdf
    • https://uploads.strikinglycdn.com/files/5416c7f1-0d83-4cfe-b310-27035c1eb8e6/43404952669.pdf
    • https://uploads.strikinglycdn.com/files/3b7f2824-33ee-4ac7-b8d2-70b51a87e6ba/22976146428.pdf
    • https://uploads.strikinglycdn.com/files/a8bd2182-99f5-4b1e-8ef3-ef89026dadaa/zonajotijuserameruzuguz.pdf
    • https://cdn.shopify.com/s/files/1/0495/9813/6472/files/xilezirev.pdf
    • https://uploads.strikinglycdn.com/files/cc4e32f7-1488-4699-a86e-b1204b5de22b/47429222702.pdf
    • https://s3.amazonaws.com/felasorarabipis/vocabulary_words_for_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/0082/2934/files/84137127047.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_off000068d1.bin
f46ab27c5fa76fc7906e79946d41186716b9393454e34488ebb57c8e8eb0a428
pdf-font-stream PDF embedded font (sfnt) at offset 0x68D1 5496 bytes
font_01_sfnt_off00007b9b.bin
a78175afd2174f66718c63ead7e1efe2fe64aecac1a7c8ea7ea376fda95e1c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9B 10232 bytes