Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6b47cd4ace81be…

MALICIOUS

PDF

40.9 KB Created: 2020-08-24 16:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a73572a9fb8f430c7ff7ad622b80d75 SHA-1: c5a9f3b9584717decba1df5f5da2b3544d6d8e28 SHA-256: fc6b47cd4ace81be921071852fcadbda14f22e0abec3859ce83feed6db5178a5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=valkyrie+profile+lenneth+walkthrough+pdf'. The document body, though partially corrupted, also contains this URL and other links that appear to be part of a link farm designed to attract users with search engine optimization tactics. The primary intent appears to be directing users to malicious or potentially unwanted content through these links.

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=valkyrie+profile+lenneth+walkthrough+pdf
    • http://files.empyreanresearch.org/uploads/1/3/1/4/131408256/6793108.pdf
    • http://kexul.westcountypediatrics.net/uploads/1/3/1/4/131454012/pozifadosop.pdf
    • http://fesegad.ianjamescarr.com/uploads/1/3/2/6/132680835/8609f782.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/45054321755.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/damifusivakuwojebij.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/game_beach_buggy_racing_hack.pdf
    • https://cdn.shopify.com/s/files/1/0450/2913/0404/files/distant_hybridization.pdf
    • https://cdn.shopify.com/s/files/1/0464/3337/0264/files/bhakti_song_video_whatsapp_status.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/25466109348.pdf
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/arearae_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/79408049480.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/86861019314.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/sandals_antigua_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/37111795595.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/nixozusuf.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_off000053f5.bin
4533eb453c8b4868af9f6c543d6b196077125fde0190dade7034c8eb6573a197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F5 5232 bytes
font_01_sfnt_off000065cf.bin
cc44e8e399feec3e68da990715945f966252f7542149c62cf2bb1fc72eb21d8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CF 10084 bytes
font_02_sfnt_off00008854.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8854 4324 bytes

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