Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39ea70817b95c12…

MALICIOUS

PDF

42.6 KB Created: 2020-08-02 08:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22e8e27b9f34076dc5425a62f42cce16 SHA-1: 9490de9407cd130479ee5b73183d44b81cf1e302 SHA-256: a39ea70817b95c128d652449ebc435a17b3edbb8718c0d565957c6cb568d1499
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=install+rabbitmq+ubuntu'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports 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=install+rabbitmq+ubuntu
    • http://files.mrsbrownsmusicroom.com/uploads/1/3/1/4/131437457/6060293.pdf
    • http://files.casacarina.co.uk/uploads/1/3/2/8/132815003/6b8ec1e0.pdf
    • http://files.gvgktang.com/uploads/1/3/1/4/131454373/kasodiledej.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/33771057687.pdf
    • https://cdn.shopify.com/s/files/1/0437/2886/3397/files/73659508616.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/51379695743.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/wisefaririrejerinoba.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/62514147371.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/80051669151.pdf
    • https://cdn.shopify.com/s/files/1/0436/2525/0974/files/tepababasutuxigu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/32675531637.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/34671148396.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/levilakawa.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/linive.pdf
    • https://cdn.shopify.com/s/files/1/0438/7497/5912/files/97585514707.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/novojibutixiketen.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000669f.bin
87ac3cf8e30931c7dcbcf5b2c46c748cb1cc94133e2cb9d19566b0a27758ff0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x669F 5032 bytes
font_01_sfnt_off000077a3.bin
5335ab58465cb8a56156027193e484c5142365579ebe9d32eea45f92aab95795
pdf-font-stream PDF embedded font (sfnt) at offset 0x77A3 11644 bytes