Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ac5ae90ae3e537…

MALICIOUS

PDF

56.6 KB Created: 2020-08-10 00:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df5f1ffd5a003ed65142c47a043b2b5e SHA-1: 7dd230c39a37920eda57a1ae3fdb499fc39384bb SHA-256: 16ac5ae90ae3e537c7d842336c518f7f7ad7cfe7e0e2fd74ac39740877a635cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for users interested in 'skinner box experiment pdf'. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility of the malicious content.

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=skinner+box+experiment+pdf
    • http://files.missladytweet.com/uploads/1/3/2/7/132712323/sabawomorixa.pdf
    • http://files.scfoodaccess.com/uploads/1/3/1/8/131856158/gezelotonixoz-nojefirimaputag-bulipo.pdf
    • http://files.w4mtp.com/uploads/1/3/0/7/130739789/jibudusefa-lapax-pakojenakikivaw-xusuxagiti.pdf
    • http://files.lunaintegrations.com/uploads/1/3/0/8/130874379/jabuxibevoridup-xudutaj-xuwonubeg-xogiveri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2344/0792/files/45106490972.pdf
    • https://cdn.shopify.com/s/files/1/0436/7443/5737/files/cell_structure_and_function_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2868/4701/files/3400523514.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/toastmasters_cc_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/jojotepulodixulesobakutog.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/guwoluxasa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/86455313904.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/xedexonuzenaruluzosizasur.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3340/files/42908519070.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81599599528.pdf
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/27713544685.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_off00008177.bin
4811a66c4700e83ffaaf10f31938e5e763c303a70d419b2a1f69c378a33a4f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8177 5144 bytes
font_01_sfnt_off000092e9.bin
7865bead38eb4b9154d157015196f4998ed02712b99b426bf0b70f63ca72e42f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E9 14448 bytes
font_02_sfnt_off0000bff0.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 16164 bytes

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