Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef782d91a22b44c…

MALICIOUS

PDF

46.3 KB Created: 2020-08-10 01:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57b5d575425e5ef9abdf0c1e1c6a076 SHA-1: 3e85f6d0c5590683aff9e39cb40dc13d7db16be4 SHA-256: 0ef782d91a22b44c0b28c90b37810fc9e9685a467532477798cf9f2d3aaec027
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to what appears to be a link farm designed to host other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into clicking it for a supposed 'rock music guitar PDF'.

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=canciones+de+rock+para+guitarra+pdf
    • http://files.kleinescountryfarm.com/uploads/1/3/1/3/131380288/zobetiper.pdf
    • http://zikebogun.matteroftimetoronto.com/uploads/1/3/0/8/130874254/4867899.pdf
    • http://gakesa.ride615.com/uploads/1/3/0/8/130814017/6993df5f9a8693f.pdf
    • http://garof.devinelydesignedproducts.com/uploads/1/3/0/7/130739777/pivuxujobe.pdf
    • http://files.danigintimacy.com/uploads/1/3/1/3/131383629/6076921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8571/6886/files/divikisomeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zogubarekerebadopotuleju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupesoxozuwimufuvijolus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/la_alquimia_libro.pdf
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/pidewakadexevawaker.pdf
    • https://cdn.shopify.com/s/files/1/0449/9190/5956/files/binary_options_trading_basics.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/xamalokosalexisobizak.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41758367329.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/83726506013.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/bayesian_methods_for_hackers_cam_davidson_pilon.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/96703089627.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_off00006b51.bin
803e98a3314af411bb7f9974e67cf2e38f0f0dd8eb9e9e78340ea9e360274ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B51 5260 bytes
font_01_sfnt_off00007d3b.bin
ac14972b7b2947834c866a693307dd83921f9e40fad0e2ab592cecd13463aa54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3B 1888 bytes
font_02_sfnt_off0000864e.bin
890b1b138cef840a8b88837b04dc4f9894d9a5467e3670033b57d180f48b3af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864E 10840 bytes

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