Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f38e98b0c2dfebb…

MALICIOUS

PDF

41.6 KB Created: 2020-08-03 23:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4635fcb6a64a40f4728ecc1a7ed2d131 SHA-1: 655ac691f03e560b3decd8a74033def1f6d039e3 SHA-256: 5f38e98b0c2dfebba4609ff1f84a46f18bda514c151333854c2f07d146fee5e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, with one specifically pointing to a known malicious redirector. This suggests the document is designed to lure users into clicking these links, potentially leading to further malicious content or exploits. The ML classifier also strongly indicated maliciousness.

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=augusto+dos+anjos+pdf
    • http://files.ifeomaanyaeji.com/uploads/1/3/0/7/130775592/daxavoxuz.pdf
    • http://files.doodadsandfandangles.com/uploads/1/3/2/6/132680901/ronifawodizod_setupuvosukuf_wewofokodefeju.pdf
    • http://files.newcreationsdc.com/uploads/1/3/2/7/132741352/1d9f56fd9028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5335/7985/files/25874363219.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/3ds_max_tutorials_for_architects.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/sifebitesixepin.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/55529816164.pdf
    • https://cdn.shopify.com/s/files/1/0431/5316/2394/files/sapupaxowegotegemijudobod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9136/files/52341327218.pdf
    • https://cdn.shopify.com/s/files/1/0435/7737/6936/files/89043253753.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2630/files/refajupitamixabaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/bank_aptitude_short_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8127/files/digi_weigh_scale.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_off0000655f.bin
681655f4e6c8555ad1ca05277baf36e28c6e7a4d7dbb9d2c791ccd03d92a9539
pdf-font-stream PDF embedded font (sfnt) at offset 0x655F 5144 bytes
font_01_sfnt_off00007706.bin
155830b2703c20ce7f21b91acccaa0ec9a04eae29cafadfdf40a6d13a50b3ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7706 10256 bytes