Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f27fa2fedea0de…

MALICIOUS

PDF

40.9 KB Created: 2020-08-28 17:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 120c82d82d1ae361c62f77ae9e3073bb SHA-1: d2f9b2ac3184619c9787f3ba99f8698b317fc8e9 SHA-256: 13f27fa2fedea0de09fa45157800947c86cf50c4f4a5015733a81907a72ae37d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm of numerous external PDF links, with one identified as a malicious redirector. The document body also contains the same malicious URL, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also flagged this PDF with high confidence.

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=how+to+booty+bump
    • http://rujikub.fcmhacc.com/uploads/1/3/1/4/131438477/d13af11b5d0f.pdf
    • http://files.therosados.org/uploads/1/3/1/6/131636612/5511a13b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/12670679374.pdf
    • https://cdn.shopify.com/s/files/1/0430/6570/4599/files/darkness_wakes_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/87246787414.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/kopex.pdf
    • https://cdn.shopify.com/s/files/1/0428/4999/2860/files/javascript_download_blob.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0499/files/tensor_calculus_made_simple_taha_sochi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/17837705950.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/52396210344.pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8720/files/amelie_piano_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/55315293063.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_off000065ed.bin
3968c83533a2433898c3b002a40ff1255fee5ec6c502a82aadfb5f4ccebe7ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 4744 bytes
font_01_sfnt_off00007611.bin
9a70e4848f0e9ba1781731b060bcf343c181dfb9461c015e6b3dd322feb7b1fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7611 9772 bytes

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