Malicious PDF — malware analysis report

Static analysis result for SHA-256 10936aa129fc7f79…

MALICIOUS

PDF

42.3 KB Created: 2020-08-17 14:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea65a94b3e9de7ae3e953376d7848a29 SHA-1: 23c0d98960b5d96acb14669c66ffbb91fc43e8b1 SHA-256: 10936aa129fc7f7920132296ba630b90c8ea5f7fadda82aa20994eb2733fb30d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to a game, likely to entice users to click the malicious link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are benign, but the primary redirector is malicious. No scripts were extracted, but the presence of embedded URLs and the ML classification strongly suggest malicious intent.

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.cc/pify?keyword=naruto+blazing+ninja+world+clash+guide
    • http://files.virginiaboyleart.com/uploads/1/3/2/3/132302824/9a274016d3f88.pdf
    • http://files.matthewnunesmusic.com/uploads/1/3/2/8/132814050/kexiraw-bixukigifapela-nekifug.pdf
    • http://towegowev.neurodiverseatl.org/uploads/1/3/1/4/131437779/9288bf3.pdf
    • http://wowume.wmbands.org/uploads/1/3/1/1/131164250/veloworuzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/97722101315.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8515/files/zoguzugizutakepen.pdf
    • https://cdn.shopify.com/s/files/1/0441/2011/3304/files/85870887057.pdf
    • https://cdn.shopify.com/s/files/1/0431/3831/8487/files/43931692134.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/doperitikutumuras.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/best_minecraft_mods_1._14.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/67421393450.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3248/files/tejimotuzuxiwijupigenelej.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/12796128458.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/ziruna.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/393340013.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/time_machine_zilean.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_off000066b1.bin
ba6b21812c33dd2f88c6fd27f2973dd189142795fe933ab1a43faf785d0b3bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B1 5528 bytes
font_01_sfnt_off0000798f.bin
5d3ea815b06d55202a5531ff833087d43cbf6d8d77e4f8042a3afbfd03212c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x798F 10112 bytes

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