Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ccf363086cef6c…

MALICIOUS

PDF

54.9 KB Created: 2020-08-24 07:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35b9434a03ae23ae9e27a987c73c569a SHA-1: d9ca75caeaf07c2781c0cc52689bd7c6205393bd SHA-256: f1ccf363086cef6c84b790df3bc3645fa89cb7836efd4011262c2d0b3297fae5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.cc/pify?keyword=aptitude+test+papers+pdf'. The document body, though partially corrupted, contains text suggesting a lure related to 'Aptitude test papers pdf'. The presence of numerous embedded URLs, including a link farm, further supports a malicious intent to redirect users to potentially harmful 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.cc/pify?keyword=aptitude+test+papers+pdf
    • http://files.jacopodellaquercia.com/uploads/1/3/1/8/131871909/mamunowuka.pdf
    • http://files.tathrabeachcountryclub.com/uploads/1/3/1/3/131379301/60e40edf9.pdf
    • http://files.evanchambers.net/uploads/1/3/1/4/131453031/d62ffee6dce90c6.pdf
    • http://files.ocvbc.net/uploads/1/3/1/0/131069879/258d9.pdf
    • http://gijaxa.valkyrisuniquedesignertiedyes.com/uploads/1/3/0/8/130814851/zupumobelezax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8223/5547/files/datetime_python_strptime_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/9811/9071/files/49839242504.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/gikozafefurumibanobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4625/6295/files/dark_souls_2_sotfs_save_editor_pc.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/50568505617.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1070/files/answer_of_shady_plot.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/download_kosakata_bahasa_arab_sehari_hari.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7383/files/rizutebujodukuzos.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/11441454984.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/soundcloud_songs_app.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5701/files/gemol.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073e9.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E9 6440 bytes
font_01_sfnt_off000083dd.bin
816c258ffb025b6807d9ca5cdec0469838f47d9c6b7fc878af7b4838542ff761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DD 4992 bytes
font_02_sfnt_off000094e4.bin
4dffe229530562cc62345e8f7f2d6dd1a768da2069613b91cb18d13ee7f8b06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E4 10560 bytes
font_03_sfnt_off0000b903.bin
6f1ff871cf6f8a11a72652b45576c366cdb39a1ef29e9eb747fa7a572d777da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB903 16132 bytes

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