Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ae18d41402f263…

MALICIOUS

PDF

46.8 KB Created: 2020-08-01 17:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ea37cc70b0e9c7a901724c0af363b5 SHA-1: 916eed52e5baa37de2a9ac899f2d56eeb4d4f4c8 SHA-256: 73ae18d41402f263d38d1e38b792bdc320d0f4ff265806e6bc513bc86fc5d024
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, specifically `https://ttraff.cc/pify?keyword=disable+windows+update`. This URL is presented in the document body, suggesting an attempt to trick the user into clicking it. The presence of a large number of external PDF links also indicates a link farm, further supporting a malicious intent to redirect users to potentially harmful content.

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.cc/pify?keyword=disable+windows+update
    • http://files.tri-box.net/uploads/1/3/0/7/130776817/e8ddad8.pdf
    • http://files.maristcyclingadventure2015.com/uploads/1/3/2/7/132710763/wumotavuvew.pdf
    • http://files.indianamainecoons.com/uploads/1/3/1/4/131453245/koronaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/54753340077.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42820491308.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/kolomugodujevunovapevud.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/jogiluzinituzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/lipisixipivaloga.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/42730726458.pdf
    • https://cdn.shopify.com/s/files/1/0440/0971/7910/files/68844389515.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/99724532075.pdf
    • https://cdn.shopify.com/s/files/1/0430/5613/6341/files/71828833333.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/wowojumurasunusagavefoten.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/verumirulekekokidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/wizemoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8941/9676/files/52209247897.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_off00007ab8.bin
0078a0e96dfa388c5a89c40a6bc579846ea4cabf56aa5b748802451733227467
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB8 5088 bytes
font_01_sfnt_off00008c29.bin
4d76210efd056311c0df18958eaea50f39dd4da49cdc73b9eaa50fc8bb6e02f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C29 10008 bytes