Malicious PDF — malware analysis report

Static analysis result for SHA-256 0896274b3a4baa39…

MALICIOUS

PDF

36.9 KB Created: 2020-08-25 03:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0debae2216c4682cb61773162e3ebc37 SHA-1: 0f4ab6e9b09d9c84f9bdafde0e36b24398a48a08 SHA-256: 0896274b3a4baa39a3d15785a2feef79678131efc8f54d598704808c722536d7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for "Nintendo labo piano sheet music". The ML classifier strongly indicates maliciousness, and the presence of many external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=nintendo+labo+piano+sheet+music
    • http://files.bingsdsm.com/uploads/1/3/0/7/130739463/zitelanax-wemex.pdf
    • http://ropiner.littlewinghollow.com/uploads/1/3/2/6/132681081/memaxagexu_fumurogomovij_nozefisiludo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5648/6807/files/bending_emt_conduit.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/acca_f9_december_2013_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/75165569568.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/30638113371.pdf
    • https://cdn.shopify.com/s/files/1/0436/3393/4496/files/90921955264.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86477918810.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/lenuzopukade.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/sebadix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/eclipse_for_jdk_1._8.pdf
    • https://cdn.shopify.com/s/files/1/0434/3054/3512/files/febadasebopar.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6582/files/hotel_booking_form_html_code.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_off00004688.bin
c20ff3707e84d50445c6aa28a976139bfa87f2f8c5723567123b931c14c8323f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4688 5208 bytes
font_01_sfnt_off00005809.bin
20cb60cc0dccb99d3c7a5938e3355d586f95377258666055425ba3d554c4f9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5809 9648 bytes
font_02_sfnt_off000078e1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E1 4324 bytes

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