Malicious PDF — malware analysis report

Static analysis result for SHA-256 73675ef829b6c22d…

MALICIOUS

PDF

63.4 KB Created: 2020-07-30 08:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 806caabc258e864f9d51a7849c42776e SHA-1: 45584b01ce2952f1d4a0dfc0fe1ca65cb345c7a4 SHA-256: 73675ef829b6c22d2eee4204a6df1dd60e26eb904399bf1da271a8ae0700ac80
154 Risk Score

Malware Insights

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

This PDF file contains embedded links that point to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains text related to 'antivertigo drugs' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious site. The presence of numerous external PDF links further indicates a link farm or redirection 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.cc/pify?keyword=antivertigo+drugs+pdf
    • http://files.webelievefoundation.net/uploads/1/3/2/6/132681694/5e603038c2b.pdf
    • http://files.eptsgym.com/uploads/1/3/1/8/131859895/gumiki_ratajolamebive_xuwuza_kujugajufipa.pdf
    • http://files.letitallstarthere.com/uploads/1/3/0/9/130969160/6410042.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/kodegorowokawujafas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8658/4733/files/14814641747.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/15413898835.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/56737435182.pdf
    • https://cdn.shopify.com/s/files/1/0431/7541/1872/files/96806595872.pdf
    • https://cdn.shopify.com/s/files/1/0441/2493/0200/files/domitelufedatawojifasaju.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/47495525804.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/73610087313.pdf
    • https://cdn.shopify.com/s/files/1/0434/0783/5303/files/74547954755.pdf
    • https://cdn.shopify.com/s/files/1/0439/1901/6104/files/51893089617.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/70031441443.pdf
    • https://cdn.shopify.com/s/files/1/0431/9667/8301/files/45878144625.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_off0000bbd7.bin
8c6f16b1057ab971083a26f1b28ee73fcf77b9e392d27bbddcecf4bff122e679
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 4900 bytes
font_01_sfnt_off0000cc97.bin
98dffcf14f4cf6da07b25a76354a068bc62cc9e559384fbe602d086609e7ba30
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 10604 bytes