Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0ceaa580810f68…

MALICIOUS

PDF

56.6 KB Created: 2020-08-03 14:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb939817ca99fdb1ba94ee035851e034 SHA-1: 73ce46e9a74c9c44b150d8c07559e674906ec0ce SHA-256: af0ceaa580810f68051917c634fa13be65ae695e4caa6d0b9531d4b2c89434a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=math+symbols+meanings+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious redirector URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site disguised as a document.

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=math+symbols+meanings+pdf
    • http://files.monskycreations.com/uploads/1/3/0/8/130814605/zadewubopubixon.pdf
    • http://files.bayareacancer.org/uploads/1/3/1/3/131381540/5e5650b005.pdf
    • http://files.caring-for-cats.org/uploads/1/3/0/7/130775980/077ce0d3f9c8a6.pdf
    • http://files.panandpantryblog.com/uploads/1/3/0/7/130739949/493a68836e.pdf
    • http://files.brainintegration.net/uploads/1/3/2/6/132695339/vokoxidux_maxifubitoru_pipig_juduvinozelowav.pdf
    • https://cdn.shopify.com/s/files/1/0440/0742/4158/files/widowikadujadiwusisuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/immersive_engineering_shader.pdf
    • https://cdn.shopify.com/s/files/1/0437/7575/4389/files/wogenexenarasumifufusezuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/60412461081.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/67228385598.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/wowivez.pdf
    • https://cdn.shopify.com/s/files/1/0428/5697/2455/files/kiruzixugekebaserilozuwuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8848/files/viwupokobepifemig.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/fire_emblem_path_of_radiance_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7253/files/witisilose.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000682a.bin
6fa14c215d30cca3b1b16f1cfe33c0df34148f50a211c2b047de4893213d4804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682A 5604 bytes
font_01_sfnt_off00007b29.bin
b6e7863cce711cdcd2c0a528c88398db8cc60b13bd9fbbb2f9a1b7aeb3687cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 19644 bytes
font_02_sfnt_off0000b925.bin
486980fe2061e8e66d29bff5ebdad583694f22d85098397dd8cf57439a29d833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 18036 bytes

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