Malicious PDF — malware analysis report

Static analysis result for SHA-256 701f79cb2359b557…

MALICIOUS

PDF

47.6 KB Created: 2020-08-08 23:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f67126b19a6a82f4dcd4a482ef55a85 SHA-1: ed9e83e9927c96d0acf8024d1e78562446b6d365 SHA-256: 701f79cb2359b55761900813e08d48ee8c1e6cf0aeab2c19c0b94046b1747600
154 Risk Score

Malware Insights

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

The PDF contains a deceptive title and numerous links, many of which point to a link farm designed to generate SEO traffic. One prominent link redirects to known malicious infrastructure, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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=atomic+structure+mcq+pdf+download
    • http://files.beclewisfiction.com/uploads/1/3/0/8/130813906/a2c530e4.pdf
    • http://files.spleitstrings.com/uploads/1/3/1/3/131379443/2425566.pdf
    • http://files.thegradcode.com/uploads/1/3/0/7/130776757/8544377.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6533/4165/files/cantatas_de_navidad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/68519377989.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/64008431943.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/rivavedurawetosevutorum.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/lirafaxezasubiwozedika.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikakaxudote.pdf
    • https://cdn.shopify.com/s/files/1/0443/0757/9036/files/convert_to_word_farsi_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/solasowusenaxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/audiogram_examples.pdf
    • https://cdn.shopify.com/s/files/1/0436/7591/0294/files/benefits_of_bitter_leaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/how_to_resize_a_layer_in_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9909/files/3000_basic_english_words.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b6.bin
8ecc2caad292708f79c157d4cadde66be37f79ca04a68bff60514b16fb3e9555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B6 5508 bytes
font_01_sfnt_off0000776e.bin
50178e0c72a63636814c4c885c22109cb67367875ad97bbb61d3ab2b2c85c0f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776E 10616 bytes
font_02_sfnt_off00009baf.bin
bafa50524f78af093df95ed27ffa029f4c146f6d2e0dc7b3cd6745066db46350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAF 16288 bytes

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