Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc67ac42a3dad50c…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 21:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 365d5b0294d07ceaf4e56825d9207c0d SHA-1: f0ce0415fe4395a58b1cc00b9fe19311e0c0550f SHA-256: fc67ac42a3dad50cd00a1d8c992e11d3cc5e3f6cd80734d41ae453261d03814c
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting a lure to external malicious 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.com/pify?keyword=graphing+slope+intercept+form+practice+pdf
    • http://files.christinehenseler.com/uploads/1/3/1/0/131070560/4154151.pdf
    • http://files.selectlearningmaidstone.com/uploads/1/3/2/8/132814048/vafilixatimupabu.pdf
    • http://files.psepa.org/uploads/1/3/2/6/132682826/ribipuder.pdf
    • http://kosizokas.jessalynlevesque.com/uploads/1/3/1/8/131856333/niresuderosaz_wibitodo_moxibagewexol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6939/files/18860567975.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/28189435203.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/troy_bilt_tb130_xp_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/99760514010.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/64464800834.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/pubovem.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/91251949920.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/22039470071.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/56390015099.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/sixiriso.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/tar_residential_lease_application.pdf
    • https://cdn.shopify.com/s/files/1/0439/2668/3816/files/gokaxesugebefov.pdf
    • https://cdn.shopify.com/s/files/1/0449/0670/9159/files/fundamental_organic_chemistry_book.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_off000051bb.bin
44e02f350bc505ef3fc748e88a62731ae8be54f593a0c3f3d8cfa14227c759af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51BB 5388 bytes
font_01_sfnt_off000063dd.bin
514b7304523e5056cf39d733696a6a4d818c75a5b8d9ca0d34deb9a0900bf759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DD 12336 bytes
font_02_sfnt_off00008b60.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B60 4324 bytes

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