Malicious PDF — malware analysis report

Static analysis result for SHA-256 424b5a2ebeda423b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 12:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3227bb25080d596fcf2754791da5e19 SHA-1: 6f30f9f326e32f6bdf802a6268edbf7d8e0709d9 SHA-256: 424b5a2ebeda423bde800377c74b6b0b12b5e2b03c5aaaf653c8be450e2b1c9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to other PDF files hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=pala+barrenadora+manual', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector suggests an attempt to lure users to 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.com/pify?keyword=pala+barrenadora+manual
    • http://files.photographybyjohnholliger.net/uploads/1/3/0/7/130775432/d8c1da8dfbc666.pdf
    • http://zimetu.sheridandesignsco.org/uploads/1/3/0/8/130813834/gogotikin-tojebir-jefezenuzogexit.pdf
    • http://files.dhwanidance.com/uploads/1/3/0/7/130738603/4625ae5.pdf
    • https://cdn.shopify.com/s/files/1/0431/4805/0586/files/gemikuzujupujowasukamofar.pdf
    • https://cdn.shopify.com/s/files/1/0436/5120/3225/files/dumamiwezedaba.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/oregon_trail_bullets.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/29380874206.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/tuzibakituwoxutivu.pdf
    • https://cdn.shopify.com/s/files/1/0458/1258/0518/files/skill_card_guide_persona_5.pdf
    • https://cdn.shopify.com/s/files/1/0437/4216/7194/files/p-_touch_software.pdf
    • https://cdn.shopify.com/s/files/1/0435/7337/9230/files/rockstar_full_movie_480p.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0108/files/additive_manufacturing_technologies_by_ian_gibson.pdf
    • https://cdn.shopify.com/s/files/1/0427/9877/6487/files/tamuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/7142/3135/files/wamobesozi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/alp_aptitude_test_book_free_download.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000620a.bin
209d8ec1ba5b7547e260e593827a24137dfa39ad65bc137a740260f66cd1206f
pdf-font-stream PDF embedded font (sfnt) at offset 0x620A 4936 bytes
font_01_sfnt_off000072a9.bin
e295eca91e7ea459c1a9a1fb061cf53a1f7e29451a01a3f244cf5539d39a5750
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A9 10496 bytes