Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a855cda9342f9d…

MALICIOUS

PDF

48.3 KB Created: 2020-08-07 17:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc313edbf45334340d46754d2cd9ffe9 SHA-1: f9701a9954380a7b408d340bbae31b3883a63d72 SHA-256: d9a855cda9342f9db61ca7813d1c1c238d3fe36e8652ed7ecb7f18eb08197851
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier strongly supports the malicious nature of this PDF. Although no scripts were extracted, the presence of a malicious URL and the link farm heuristic indicate a likely phishing or malware distribution attempt.

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=berg+balance+scale+pdf+deutsch
    • http://files.strategiesforwriting.org/uploads/1/3/1/4/131438190/3404798.pdf
    • http://files.jessicafleck.com/uploads/1/3/1/8/131857626/c8b8d70.pdf
    • http://files.donviecelli.com/uploads/1/3/1/6/131607407/5597811.pdf
    • http://files.iainmcnallyvirtualtours.com/uploads/1/3/2/7/132712174/widoj-tekijizetuforab.pdf
    • http://files.georgiahistoryteacher.org/uploads/1/3/2/8/132814343/putipodofoten_kalikud_bebesefoxatos_vorew.pdf
    • http://files.iainmcnallyvirtualtours.com/uploads/1/3/2/7/132712174/widoj-tekijizet
    • https://cdn.shopify.com/s/files/1/0429/4367/6582/files/commonwealth_map_fallout_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/rijusuboxoxevura.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/kerujezowemenogekid.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/mapojabewewuponaka.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/15148551934.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0160/files/xikonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/busefidesanupo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/form_130_u.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/33035275316.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007417.bin
dfe83e90e7b6fefbec2819dcce2a9315d39e8bb80831408351c943c71b5336d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 5604 bytes
font_01_sfnt_off0000871b.bin
c2d24ad529442cc96e2fbc209555623f184b04215f2a2cd3b3404b70c38ecac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871B 14288 bytes

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