Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f1711ef7e347c6…

MALICIOUS

PDF

39.6 KB Created: 2020-08-20 06:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6997afc2fee490181891269c3a2babf SHA-1: 4eccf99c0083de529e3675c1bc6ff90607cf327c SHA-256: a0f1711ef7e347c6d0ed27a906f4261570cbfdf0248ea47f945ec700d19f4537
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=que+es+un+agar+pdf, which is part of a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to Shopify domains, many of which are likely part of the link farm. The ML classifier also strongly indicated maliciousness.

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=que+es+un+agar+pdf
    • http://files.shannonmora.com/uploads/1/3/1/4/131453065/lepekubajol.pdf
    • http://files.sewingisabusiness.ca/uploads/1/3/1/3/131380759/18943a0.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5169/files/cover_letter_for_cv_examples_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5992/7448/files/98346934646.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9936/files/crenshaw_intersectionality.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/bessel_s_correction.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/80892656033.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/eso_clothier_power_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/20831889499.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_off00005cc4.bin
e5782dab4c0fbdc4deef0b05dac5c6735955f2ad5cecc7d1063254afbdf65269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC4 5236 bytes
font_01_sfnt_off00006ea2.bin
e16177301037a580e06432ba5c2f1400dc7b749ae8552d9ed118e5b8af61aee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA2 10516 bytes

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