Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a99f55d93daff2…

MALICIOUS

PDF

43.9 KB Created: 2020-08-25 12:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8505f70389cf6534f09640b415cd03b9 SHA-1: 7e90c9cfb7bd3b02146a7f21de9f0854978524f6 SHA-256: 78a99f55d93daff21396c771df0702dccda501ca30d335f53f54796d581352e8
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 a redirector service (ttraff.ru). The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'racing car game'. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of a phishing or scam 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=racing+car+game++jio+phone
    • http://files.brockskillslab.com/uploads/1/3/2/6/132682851/tawemib.pdf
    • http://files.weberworks.us/uploads/1/3/0/9/130969904/tobefovusili.pdf
    • http://files.shadesofartistry.com/uploads/1/3/1/3/131380729/6183016.pdf
    • http://wepivurit.eloisekerr.co.uk/uploads/1/3/0/8/130813528/tusejupanurog.pdf
    • http://files.foothillscanine.com/uploads/1/3/0/9/130969075/wufopomoxikexeforo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/6081/7048/files/anandamayi_ma_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/maruwawixogini.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31443612403.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/supup.pdf
    • https://cdn.shopify.com/s/files/1/0434/6747/3046/files/spy_mouse_game.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/rirojazup.pdf
    • https://cdn.shopify.com/s/files/1/0437/2840/4632/files/zivitinusilumuvanemej.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/amma_photos_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2743/files/44991776682.pdf
    • https://cdn.shopify.com/s/files/1/0433/7165/9414/files/sitevapidibevizizam.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/14147425585.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/18772791712.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_off00007049.bin
8236e3071b73c1a5cf90ae5651074e4b63fe43ea950b74e676fb05f353480d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7049 5220 bytes
font_01_sfnt_off000081e4.bin
b0b7c7f974d6eb463cf6706320caa1fc22d2aaa0d1305b0532f8c9fe702e3ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E4 9660 bytes

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