Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ef6a5314ad97bf…

MALICIOUS

PDF

45.2 KB Created: 2020-08-18 21:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33968ae7aec60d3033c4e0e796ed6e0c SHA-1: 5d40a496b7aaa7ba852ff4dbc4dc76ad682ddeb4 SHA-256: f5ef6a5314ad97bf65495a60b531433ac41cff7a624a5c16e774d4a4357030b7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was identified as malicious by a machine learning classifier and contains multiple heuristics indicating malicious intent. Specifically, it features a PDF link farm with numerous external links, one of which, https://ttraff.com/pify?keyword=fidaa+bengali+movie+video+song+hd, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The file's purpose appears to be to redirect users to malicious content through a deceptive link.

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=fidaa+bengali+movie+video+song+hd
    • http://files.beechercityilevents.org/uploads/1/3/0/7/130740462/9335740.pdf
    • http://sovuvuja.chathamhighlandsna.com/uploads/1/3/0/7/130776366/gidirozixetog-finebetizajonen-lejidesavim.pdf
    • http://kixazuwiz.soheilaazadi.com/uploads/1/3/0/8/130814328/1986612.pdf
    • http://files.blissdough.org/uploads/1/3/0/9/130970004/4df25b.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/poxepebozu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6936/4631/files/93461252808.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/zoriwedakol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/ganewolubopoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1294/8121/files/75621468432.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9324/files/coffee_shop_business_plan_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/76491789797.pdf
    • https://cdn.shopify.com/s/files/1/0440/1253/5958/files/advanced_wastewater_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/12556853611.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/tagayun_building_design.pdf
    • https://cdn.shopify.com/s/files/1/0450/7552/9891/files/losog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005535.bin
72c0eb6ba32343ce81a366ea698828ed325ee22af433978209c72a79f1bdb244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5535 5296 bytes
font_01_sfnt_off00006715.bin
59ff901d3e723210cfd7672ab2947a74e43ba18ebf36ed0878693ad941fbf068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6715 9256 bytes
font_02_sfnt_off0000841a.bin
7ee9d282599e9c8c19c56955f8144e2a0d6cfb168c4fc14824484912571de954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841A 10276 bytes

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