Malicious PDF — malware analysis report

Static analysis result for SHA-256 124ac679ee0b2235…

MALICIOUS

PDF

37.0 KB Created: 2020-08-29 20:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b50dfa56561710f42ed5e322b51939 SHA-1: c63f619f72039aa123fdef229b7d33add7a69dab SHA-256: 124ac679ee0b2235b7d47ff70bc24ea5d591d14d184ca4fa938df8437d91fd86
154 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to "free brickmania instructions" and the malicious URL. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious 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.ru/wix?keyword=free+brickmania+instructions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/punipulodugux.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/lalunor.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/doodle_god_ultimate_edition_achievement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/24157999186.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/duzekejojobokemobuseketi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7253/files/kesinefofojunen.pdf
    • https://static.usrfiles.com/ugd/b8c837_477a9aa39b4845dcbe26f16521782329.pdf
    • https://static.usrfiles.com/ugd/b8c837_9109b88c05074a64ba9531a98d372619.pdf
    • https://static.usrfiles.com/ugd/34ec99_0e0ee4b7359548389431de10ff8e81f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cec5fffabf6c46e29bee0d0afaadb69c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/23615319826.pdf
    • https://cdn.shopify.com/s/files/1/0433/9597/3271/files/zojemejozilofazomobidi.pdf
    • https://cdn.shopify.com/s/files/1/0462/3692/6103/files/77890126557.pdf
    • https://cdn.shopify.com/s/files/1/0433/4390/4927/files/99130627477.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_off000051fd.bin
9fe69ea12a3b708808c899cc547801f85ff45212ff864d4853d1d2c955718bbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x51FD 5072 bytes
font_01_sfnt_off00006322.bin
cc9feb3f7a614f9e3f00809e2cc9d6a7cc449753c1e74a263934a354f0563ce9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6322 10528 bytes