Malicious PDF — malware analysis report

Static analysis result for SHA-256 08aac13250aaefa7…

MALICIOUS

PDF

40.5 KB Created: 2020-07-31 23:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 224533bf8aa82156018d2ee41b9194f2 SHA-1: 946b313e62773827385e77124b2a317ccba648d1 SHA-256: 08aac13250aaefa7e70ea295d9e8fb18f0cf3ec361d61aa042b0525c2f998049
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 of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=how+to+select+all+in+vim', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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=how+to+select+all+in+vim
    • http://files.rmofprairiedale.com/uploads/1/3/0/8/130874317/wuture.pdf
    • http://files.sile765.com/uploads/1/3/0/8/130813427/doxazufobotuwe-vejoxisul-jexozalo.pdf
    • http://files.tjeffersoncarey.com/uploads/1/3/0/8/130814172/mujoluwaxabewunun.pdf
    • http://files.enlightenfredericton.com/uploads/1/3/1/4/131453512/4116366.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/25723790183.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/64983383783.pdf
    • https://cdn.shopify.com/s/files/1/0432/4845/1739/files/82839032348.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/92134285552.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/33802236490.pdf
    • https://cdn.shopify.com/s/files/1/0436/3098/5376/files/46597838196.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/babowosikiteze.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/12663947160.pdf
    • https://cdn.shopify.com/s/files/1/0430/2202/4867/files/29852504447.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/nodatasoden.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/famimodiveluvolat.pdf
    • https://cdn.shopify.com/s/files/1/0440/5778/8568/files/46010852305.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_off00005f94.bin
539972d3a8848b76a6c9c1353ca7690c671bb70a35f3c77b56b386afdb7d2904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F94 4960 bytes
font_01_sfnt_off0000707d.bin
e2bf94434a879d9ee9f0b06cf18655bbae665d412566f7082c0b3ec8a5009036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707D 10756 bytes

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