Malicious PDF — malware analysis report

Static analysis result for SHA-256 042599584cfa9131…

MALICIOUS

PDF

42.7 KB Created: 2020-08-24 15:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f70a05ddf8b271db318ca2892ad881ec SHA-1: 5fc25f670f65d881aee2641766fada04b64a5b9d SHA-256: 042599584cfa913190597f6070195580a61f293157912d505b5e89c78be90d0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector. The presence of a large number of external links, many pointing to PDF files hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=hellboy+2004+imdb+parents+guide
    • http://files.additadvertisingsa.com/uploads/1/3/1/0/131070030/vewowiruke.pdf
    • http://files.stephaniegalyon.com/uploads/1/3/0/8/130815009/wupekuz-dufajazorerixed.pdf
    • http://files.sullenwhimsy.com/uploads/1/3/1/4/131438071/4117a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6888/2072/files/ranaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/kipebugemajikesivekokuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/full_form_of_cdc_in_computer_language.pdf
    • https://cdn.shopify.com/s/files/1/0435/2815/9396/files/dead_men_s_path_achebe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/25204201321.pdf
    • https://cdn.shopify.com/s/files/1/0436/0873/5907/files/29267889633.pdf
    • https://cdn.shopify.com/s/files/1/0465/0873/6662/files/81239044297.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/kozagitefu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/bluetooth_peripheral_device.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_off0000673b.bin
f065f22fc6678b59cd55c559c86a55d10c81e8003108022db308089919322c76
pdf-font-stream PDF embedded font (sfnt) at offset 0x673B 5844 bytes
font_01_sfnt_off00007b03.bin
6adb980fc65a8838237dd71a881dbf61ebc454fedc6de8e9ec55dce76663e1ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B03 10192 bytes