Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91ec735b028f3b6…

MALICIOUS

PDF

51.3 KB Created: 2020-08-24 13:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09de4ec1a3c7a20cb7be2fb0d39df1f4 SHA-1: 9d1f69f650c9f5664d19a616f378852434c4705c SHA-256: c91ec735b028f3b616d9cc43a30f96b4ea18a4ae6fe9b450dc962fbd1d10d03d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=action+plan+template+for+risk+management'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify, suggesting an attempt to leverage legitimate platforms for distribution. The ML classifier strongly supports the malicious verdict.

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=action+plan+template+for+risk+management
    • http://files.tekesintidewater.com/uploads/1/3/2/7/132710795/rosudofaf.pdf
    • http://files.elementsofgray.com/uploads/1/3/1/4/131408204/mosexinewow_soxirorebazixu_vipasigibikevak_zesutuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/16250432820.pdf
    • https://cdn.shopify.com/s/files/1/0440/7037/1493/files/kundali_bhagya_serial_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/89364975124.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/problem_solving_cognitive_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3302/files/vovomatuduk.pdf
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/jebolijepaxukotakerova.pdf
    • https://cdn.shopify.com/s/files/1/0431/3094/5693/files/dedarowozufonap.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/16894736173.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/kisesojarovetutepemezajo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7333/files/72255615146.pdf
    • https://cdn.shopify.com/s/files/1/0433/5229/3541/files/sixuzazezodikevuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/renfe_rodalies_mapa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/24750820013.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_off00008aae.bin
7cd9715b383359be6573e59ff177abb888ac1e675523cae900fa0ab85d97579c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAE 5388 bytes
font_01_sfnt_off00009ce7.bin
1d2fa7bc1f5e22375204ac0ac87811cf92927ea8e99514fecb3055b35e9b07bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE7 10288 bytes