Malicious PDF — malware analysis report

Static analysis result for SHA-256 817ee79b5b357c76…

MALICIOUS

PDF

36.5 KB Created: 2020-08-16 10:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cddb78bbc37b52328750e651f1de71e3 SHA-1: c2f86967ce818a4871868200b7d54a06f687cd68 SHA-256: 817ee79b5b357c769a4d05c9bd2f554819c01c6484acc5ad081a61558d724984
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=corbin+russwin+ml2051+template'. Additionally, it exhibits a PDF link farm with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site. The presence of embedded URLs and the ML classifier's high confidence further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.ru/pify?keyword=corbin+russwin+ml2051+template
    • http://files.lhec.org/uploads/1/3/2/6/132682235/0a40c5a84c7e85.pdf
    • http://nolavedok.mx.reinventing-reality.com/uploads/1/3/0/8/130874493/81e37936.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/9284/3422/files/brushless_dc_motor_primer.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/urban_dictionary_lemon.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/24612547934.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/siripepexezexok.pdf
    • https://cdn.shopify.com/s/files/1/0429/2889/8211/files/kodefig.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/moxafapoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/attestation_de_salaire_remplissable.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/the_hungry_tide_by_amitav_ghosh_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/21497728770.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/babadesozimezezemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/xigidedukafoxodigepi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000436c.bin
b9939784c8c0b276636f7d6b8eb17e8809eab018633361694d4168d1b259d537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x436C 5552 bytes
font_01_sfnt_off00005648.bin
cfc1c5e444975cba931ec180ef5717cbfcdb225f5fad2f7406f121559012c98a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5648 9560 bytes
font_02_sfnt_off0000770e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770E 4324 bytes

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