Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dc853f941676fb…

MALICIOUS

PDF

48.4 KB Created: 2020-08-18 17:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f1428a620d28b1cbf63ec709d4092f7 SHA-1: d802729119ad1b55f7fda86bf7e86dafd5d72a07 SHA-256: 66dc853f941676fb0a44d72f219186bcc162db5c3867aa81b9c04e65192e8cf0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is ttraff.ru, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to the same malicious URL and benign-looking PDF files, suggesting a link farm or SEO poisoning tactic to disguise malicious intent. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=lego+cmf+disney+series+2+feel+guide
    • http://files.paiboon.biz/uploads/1/3/0/9/130969220/guwijuse_xiwadazifod.pdf
    • http://botog.sholafitnesstrainer.com/uploads/1/3/0/9/130969525/16dc965d7e37c8.pdf
    • http://files.schoolofmythsanddreams.com/uploads/1/3/0/7/130776757/c79d426a0558.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/causes_of_noise_pollution.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/tagojojivisudusekezub.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/natural_disasters_mod_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0306/files/telemecanique_altivar_58.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/98541955882.pdf
    • https://cdn.shopify.com/s/files/1/0435/4569/0266/files/education_in_the_dilemma_of_a_ghost.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/5761719672.pdf
    • https://cdn.shopify.com/s/files/1/0432/4737/0402/files/english_amharic_medical_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/eclipse_java_photon.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/brief_self_introduction_ppt_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/8572/3816/files/54654196616.pdf
    • https://cdn.shopify.com/s/files/1/0453/9786/8712/files/soduzurotazas.pdf
    • https://cdn.shopify.com/s/files/1/0434/1789/5070/files/sekavifumelomeniwugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/14271518994.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067a1.bin
c1710ad2c96574817f74c0e8cb45e346b600e89cffc2f0a066f8e51de2c67d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A1 5308 bytes
font_01_sfnt_off000079af.bin
5c67d10afb98d0160b265acd1ffe2d4c4ef4a3e0c13a8ebdc8740781e660b602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AF 10484 bytes
font_02_sfnt_off00009dcc.bin
b098da79dd067f31ba2c2b8c1c5e919600cd02ab140df2a372f8f699e4c507e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCC 16076 bytes

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