Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d42ce5c42490165…

MALICIOUS

PDF

46.6 KB Created: 2020-08-23 13:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cd14a069d9b01fe16c5843872f15706 SHA-1: fa8a75fb9051d0f890dd9712d02bc1e3fdbf2e6e SHA-256: 7d42ce5c42490165c11041980a08432e6ae61634d652822b9cff4a860a0f85e9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to benign Shopify URLs, but one critical link redirects to `ttraff.ru`, a known malicious redirector. The document body, though heavily obfuscated, contains this malicious URL and other benign-looking PDF links, suggesting a lure to download potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=mathematics+vision+project+module+1+answer+key
    • http://files.muluki.com/uploads/1/3/0/8/130813511/9299871.pdf
    • http://nulan.holytemplec.org/uploads/1/3/0/7/130776321/301983.pdf
    • http://files.dancetoyourheartsdelight.org/uploads/1/3/1/3/131398560/9587754.pdf
    • http://benujebav.susan-mcmahan.com/uploads/1/3/1/3/131398140/gugowivawe-gojilerotanukub.pdf
    • http://files.m.alissweettreats.com/uploads/1/3/1/4/131406473/9859126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3768/5920/files/48205929318.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3155/files/83596484866.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/dezalokikexumodes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/fundamentals_of_graphics_communication.pdf
    • https://cdn.shopify.com/s/files/1/0434/6760/4128/files/24289807063.pdf
    • https://cdn.shopify.com/s/files/1/0437/5832/1818/files/tamil_bible_quiz_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/apple_pages_cookbook_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/4472/3098/files/cyber_bullying_article.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/38909071220.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006431.bin
365aa8c47a4b31515895d58d867721049c28f37a919897cfa0706f2060a51a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 5648 bytes
font_01_sfnt_off00007757.bin
6e520027c66ad76e4dcb6cfda7fab828c08d95da67b8ddd02979df96a969bf2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7757 12208 bytes
font_02_sfnt_off00009f34.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F34 4324 bytes

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