Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ac1b3e68f1c14b…

MALICIOUS

PDF

50.3 KB Created: 2020-08-11 00:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 317ac5f1c09e3ed95a832eb44398d403 SHA-1: 014e9b4b3c292a372983fcdbb1ea3e9ca7ba2fcb SHA-256: c6ac1b3e68f1c14b6ea51fac372c5c5972159f659beb5034855586fba79d2265
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 a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'geometric sequence and series pdf' and the malicious redirector URL, suggesting a lure to trick users into clicking the malicious 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=geometric+sequence+and+series+pdf
    • http://files.oppositetack.com/uploads/1/3/0/8/130813054/rabavaporu.pdf
    • http://files.mallratsofamerica.com/uploads/1/3/1/3/131398010/41e32d.pdf
    • http://files.consoltech.org/uploads/1/3/1/3/131383613/1882968.pdf
    • https://cdn.shopify.com/s/files/1/0439/2806/0059/files/gears_of_war_2_collectibles.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2578/files/29491863380.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6641/files/arrl_technician_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2636/files/50173788406.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/88584341298.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/65725237921.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/barren_woman_sylvia_plath.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/carbamates_pesticides.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/95754713687.pdf
    • https://cdn.shopify.com/s/files/1/0432/7669/7760/files/intex_pool_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/bipisinebuburiroxopogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8167/files/vomavokexenazuvepemunexi.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_off00007cd3.bin
a8629e8d1edcbddbbf2480686d44ac60a7524898a05ad550e14e9229d5d7e80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD3 5424 bytes
font_01_sfnt_off00008f37.bin
46fb99280fe9f62f0d3f64423258464200a7b95bce839fee4015517e890a0ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F37 14408 bytes

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