Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c4e720e6a9a91e…

MALICIOUS

PDF

48.3 KB Created: 2020-08-23 04:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9747046f39149848988442cc8a7237df SHA-1: 62461be168e4f617395b24770e97f67effa7eabe SHA-256: 81c4e720e6a9a91ed9ed4d6b090950e68839fa8967f497c1a1c3d8b1be36a526
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One prominent URL, 'https://ttraff.ru/pify?keyword=go+kart+blueprints+free', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document body, though partially corrupted, contains the lure text and the malicious URL.

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=go+kart+blueprints+free
    • http://kagapa.mastropiece.com/uploads/1/3/2/6/132681647/jubelubetibo-suzebu-gudekerud-risabamuto.pdf
    • http://files.andicho.com/uploads/1/3/0/8/130814475/xexaxobilibe.pdf
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdf
    • http://gopodaxom.rosarycafe.com/uploads/1/3/1/8/131856330/4877637.pdf
    • http://jevunusez.americaimproving.com/uploads/1/3/1/6/131606677/c3d1e4149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/apostila_alemo_basico.pdf
    • https://cdn.shopify.com/s/files/1/0437/5566/7605/files/good_charlette_dance_floor_anthem.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/57839534169.pdf
    • https://cdn.shopify.com/s/files/1/0428/5123/8047/files/philippine_standards_on_auditing.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/24724013470.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/95939924399.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2636/files/buick_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27588499931.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/33854443340.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/algebra_1_homework_practice_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/6531/0373/files/65824291460.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070c7.bin
0905c75a2805a2fc9b4faea8fb986e7b4dc7e3a593cba8690b1c0b038c3a9abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C7 5132 bytes
font_01_sfnt_off00008248.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8248 1800 bytes
font_02_sfnt_off00008ad6.bin
97d68e926ecbff524003bab86ef9248fec53f1669cf8e678c01dfb8f383c15b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD6 12928 bytes

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