Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fc395daae74fd9…

MALICIOUS

PDF

40.4 KB Created: 2020-08-24 14:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dccccea197160452ac0ab77f184999c SHA-1: 1782c449072c1169fe0a3565672e5f5f6174f254 SHA-256: 97fc395daae74fd9d2e90bc3b591329d85a2d2f28449c13a8d2434b317df0af6
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating it's a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=sample+formal+letter+format+for+school, which is likely used to obscure the ultimate destination of the attack. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm suggests a social engineering or phishing attempt.

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=sample+formal+letter+format+for+school
    • http://files.ardenemil.com/uploads/1/3/2/6/132681884/3968046.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/10872889164.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/2711025153.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8920/files/71000898386.pdf
    • https://cdn.shopify.com/s/files/1/0437/9521/8594/files/alejandra_pizarnik_libros.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/9150137844.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/tinker_tailor_soldier_spy_novel.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/38501881101.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/all_tinkers_construct_modifiers.pdf
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/for_loop_in_bash.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3020/files/nawowaxiriniwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7371/5880/files/high_quality_explosion_sound_effect.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/bamudarepixixodu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8701/8649/files/44316918905.pdf
    • https://cdn.shopify.com/s/files/1/0428/7486/3772/files/59431577447.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/kavisumasifejeb.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_off00005f97.bin
7ebe913a1f040f809c0617d3db83990ae487dca7abcb8b0048f1429c3a4068e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F97 5356 bytes
font_01_sfnt_off000071ac.bin
92bea6f214987838e8293ef21d7ff76807ff2a96debb9db8674cca5e8902b4ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AC 10168 bytes

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