Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31c91b984f73dea…

MALICIOUS

PDF

50.4 KB Created: 2020-08-11 05:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5e2f926f40c96e2919d4e4d492dfd59 SHA-1: 6d347a29c398c65cef5063d31a38f80526fb4548 SHA-256: d31c91b984f73dea4d6e8f2144f7aba8eec283003d307e08b1ecd6fc4fa351e5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning tactic to distribute malicious content. The document body, though heavily obfuscated, contains the string 'Ac126 transistor datasheet pdf' and the malicious URL, indicating a lure to trick users into clicking the link. No scripts were extracted, but the presence of the malicious redirector is the primary indicator of compromise.

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=ac126+transistor+datasheet+pdf
    • http://files.constructioncareerdaycc.org/uploads/1/3/1/6/131607374/9392690.pdf
    • http://files.longjourneyhome.net/uploads/1/3/1/3/131380063/puzujarururi_wetatefi_pexukegoleg.pdf
    • http://files.bsatroop65.org/uploads/1/3/1/0/131070527/977b95a.pdf
    • http://wumuw.bethecareerchange.com/uploads/1/3/2/6/132681352/8251781.pdf
    • http://rokad.ntqgchicago.net/uploads/1/3/0/8/130813095/nemawajodotakituru.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/23882122464.pdf
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/delipinezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/doluramu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8135/0820/files/audit_risk_assessment_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0430/6488/5397/files/saxojigavumibopuxuxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8172/7129/files/pinuverakunumijerewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9308/2783/files/bookboon_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3929/files/rafiq_azam_architecture_for_green_living.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/subnautica_plasteel_ingot.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/81345498317.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/divide_and_conquer_algorithm_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/water_resources_engineering_wurbs.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/80964872009.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070b8.bin
3949d6735223fce50e0e6ee347d9eb108811c455e91885101762610b4dc09c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B8 4068 bytes
font_01_sfnt_off00007f31.bin
89bd1b8b1af44abaca8aa352a8311af571390856323a891602a2fabcb5e21923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F31 5536 bytes
font_02_sfnt_off000091f2.bin
4242646a8bd25e3addf031a808184fe5e2c740862e3db440c9ee9b65643cd5d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F2 13364 bytes

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