Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc62eeb0ae330859…

MALICIOUS

PDF

52.7 KB Created: 2020-08-07 08:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecac6ee41a7b4e157ea9aa61de3073ba SHA-1: 683e68253910a3e1e336267121d3fbf120cff0f6 SHA-256: dc62eeb0ae3308593b5156da0982ce6ba76c71081e5af917286deaddb2173fe6
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=rational+root+theorem+proof+pdf', is designed to lure users into clicking it. The document also contains a large number of embedded links to external PDFs, many hosted on Shopify, which is indicative of a link farm or SEO poisoning tactic. No scripts were extracted, but the primary malicious function appears to be the redirection to the ttraff.cc domain.

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=rational+root+theorem+proof+pdf
    • http://files.abigailpalko.net/uploads/1/3/1/8/131856331/d6cf9edb281.pdf
    • http://files.kingdomofhabbo.com/uploads/1/3/1/4/131438843/80ab7386f1d.pdf
    • http://files.pamensgymnastics.com/uploads/1/3/0/8/130874317/koxopabani_namurotelu_fixovuwatabun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/topinuxolobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9109/files/split_your_lungs_with_blood_and_thunder.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/tasuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/kowovesimusemoliv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/63941179396.pdf
    • https://cdn.shopify.com/s/files/1/0445/6900/2143/files/darnified_ui_oblivion_nmm.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/50714426266.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1351/files/guxaremo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/statistics_for_spatial_data.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/current_affairs_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/tutivawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/tififofukosewozo.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_off0000639f.bin
c51118fb2d94d2f75dc013f174502ccd528feefdf7ce2c571855d909d250ff83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 4900 bytes
font_01_sfnt_off00007415.bin
98eb4f47baaa65e72107077f6682455a37c561859423b728cda5189e59e00bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7415 14484 bytes
font_02_sfnt_off0000a1d9.bin
58ddc94b67e0355b4f295b70f79b21e00ca1312f79f820a038979a253bff27eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D9 16196 bytes
font_03_sfnt_off0000b70b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB70B 4324 bytes

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