Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cffeb8e62d20c4b…

MALICIOUS

PDF

42.6 KB Created: 2020-11-08 02:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77f54ef9cbdf12f6a62cf175bf8723b4 SHA-1: 5fc807662612169ce0436615dd1a2a48ddbfe6b0 SHA-256: 5cffeb8e62d20c4be3f7e8cea14f0020c405bcb684053a7d1cf7c78443533e63
144 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a significant heuristic firing indicating a link farm. The document body, though partially obfuscated, contains text related to 'request' and URLs, suggesting a lure. The presence of a PDF_URI heuristic pointing to 'trafffi.ru' and a PDF_SEO_LINK_FARM heuristic indicates a likely attempt to direct users to malicious or scam-related content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=as+per+your+request+to
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f8e3207229b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tumasun/dazubawuvetilew.pdf
    • https://s3.amazonaws.com/panalipolifod/98198698415.pdf
    • https://fujoluposo.files.wordpress.com/2020/11/necta_go_tz_psle_results.pdf
    • https://s3.amazonaws.com/xenavuxa/genetics_and_molecular_biology_of_entomopathogenic_fungi.pdf
    • https://s3.amazonaws.com/zesotat/netamafif.pdf
    • https://s3.amazonaws.com/megulu/blood_pressure_medications_list.pdf
    • https://ditajixinemi.files.wordpress.com/2020/11/skyrim_best_fortify_enchanting_potion.pdf
    • https://nekonenos.files.wordpress.com/2020/11/world_history_study_guide_unit_1.pdf
    • https://uploads.strikinglycdn.com/files/74446d43-4afd-4002-92ae-0bdc1149ebe4/tozevagisikodetiwokev.pdf
    • https://s3.amazonaws.com/runuzitexokol/plural_of_la_clase.pdf
    • https://s3.amazonaws.com/lovetijif/badobefogapavumabanamu.pdf
    • https://didigonoxi.files.wordpress.com/2020/11/kitna_pyara_tujhe_rab_ne_banaya_mp3.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_off000068b9.bin
5fa4f3d9e59cd260fcbe80ea089e15f4d4fa17bae6d4d669dbb66dddb3eb2342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B9 4788 bytes
font_01_sfnt_off00007924.bin
0583fdab014db47d19e310ee1dc8d5840f17ebbe261ba43414c4bae93923c07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7924 10656 bytes

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