Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b86e02be7b71427…

MALICIOUS

PDF

47.7 KB Created: 2020-08-11 02:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b7e932e761f75ab4d7df3e8cd95ea73 SHA-1: 52b14dfc7b3b914e3453be3c6e9084be29ff4fda SHA-256: 0b86e02be7b7142719df3f2adb7adedeead4ec56e9351c0d8615b1e4024b4ee7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This indicates a likely SEO link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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.ru/pify?keyword=approximate+quantities+method+of+estimating+pdf
    • http://files.augustasquarecondos.com/uploads/1/3/1/8/131857717/37a509.pdf
    • http://detobema.theirelandwalkingguide.com/uploads/1/3/0/8/130873951/tereke_desusenixegumep_delalomitupajir.pdf
    • http://files.heartbirthandbaby.com/uploads/1/3/2/6/132695535/9707626.pdf
    • http://files.saltxpepper.com/uploads/1/3/1/4/131409017/tadovo.pdf
    • http://files.mwilkinson91.com/uploads/1/3/0/8/130874435/4b44b23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/ripetuzapod.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/gatetidokoxalutirefurer.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/zombie_bullets_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/mikamer.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/lonatasafobikanefusepa.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/learn_korean_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/mutoliwapiweruju.pdf
    • https://cdn.shopify.com/s/files/1/0431/4959/0690/files/31289788539.pdf
    • https://cdn.shopify.com/s/files/1/0431/8992/8096/files/niwebojimejativu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/68943470335.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/47493335436.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8447/files/52078136396.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_off00007b33.bin
e223de63581c6e51c80bfd4b286253cbde25d7ee5ac98cce551097d9a21acb84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B33 5604 bytes
font_01_sfnt_off00008e0e.bin
5af8daf51831c8f8a1813d5ab6e067ee5a5ecdd48b1f687097ebd5c19da3c951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0E 10252 bytes

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