Malicious PDF — malware analysis report

Static analysis result for SHA-256 210304decc7e3433…

MALICIOUS

PDF

44.4 KB Created: 2020-08-25 05:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06683a8177b24a0cafc0552c259d207 SHA-1: 765599d9bdb74549b7484bf9da2a3d6d1a703ea0 SHA-256: 210304decc7e34339101d85b05fe99de0ff6368fc046b27a3e18302021e759a4
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, specifically pointing to 'https://ttraff.cc/pify?keyword=blackmart+old+version'. This indicates a phishing or social engineering attempt to direct the user to malicious infrastructure. The document body, though heavily obfuscated, contains references to this URL and a large number of other PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious.

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=blackmart+old+version
    • http://files.strikingtela.com/uploads/1/3/1/6/131607164/31caa64fa7.pdf
    • http://sikexosi.blastingworksolution.com/uploads/1/3/0/7/130776819/0c3cc67c38.pdf
    • http://files.aandwtransport.com/uploads/1/3/0/7/130740553/joberepox-xotekarinaza-gidujebekimu-burutiz.pdf
    • http://fenofawe.schnepfsveggiedrivethru.com/uploads/1/3/1/3/131380042/wapozi.pdf
    • http://files.tommyreddicks.com/uploads/1/3/1/0/131069899/xonuwepe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/burrows_wheeler_transform_decode.pdf
    • https://cdn.shopify.com/s/files/1/0437/4223/2725/files/fafekubud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/46424049882.pdf
    • https://cdn.shopify.com/s/files/1/0434/9178/6918/files/nawata.pdf
    • https://cdn.shopify.com/s/files/1/0438/0239/4786/files/85299680130.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/juzegawoxuxazulolesim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/gugutom.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/80497874721.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/tabukus.pdf
    • https://cdn.shopify.com/s/files/1/0435/6122/2307/files/devore_probability_and_statistics_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/html_to_javascript_angular.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_off00007086.bin
2e0ace4bd30fe27797a06c26ca476b1c0403ab5599f9499177547df591ea0b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7086 5256 bytes
font_01_sfnt_off00008254.bin
bb102329cc24989791a931f1691c8060afd1638a704c8f050549667788c423e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8254 10192 bytes

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