Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eb93078075f6b5…

MALICIOUS

PDF

47.5 KB Created: 2020-07-29 11:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 304b69ce04fecb782e3b1e7a3255fa8c SHA-1: 20fffd98f23e3a13bcee6e48d848fc93ed9b203a SHA-256: b0eb93078075f6b54f14ae09b4e8192bb5998d05e10440b4a020e41a4affaf3e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that point to a known malicious redirector (ttraff.ru) and a large number of other links, indicating a link farm for SEO manipulation or phishing. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'international auditing standards pdf 2020', suggesting a lure to attract users interested in such documents.

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=international+auditing+standards+pdf+2020
    • http://files.faithtowalkministries.com/uploads/1/3/0/8/130814492/0b706f028e.pdf
    • http://files.mtasoftball.com/uploads/1/3/1/8/131871642/9457994.pdf
    • http://files.joseluisperezjim.com/uploads/1/3/1/3/131383553/gejuxab.pdf
    • http://files.artscarafes.com/uploads/1/3/1/1/131164473/vapixavase.pdf
    • http://files.joseluisperezjim.com/uploads/1/3/1/3/131383553/
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/24905242696.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/xikigevonipazano.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/38950994272.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/zobenimesaled.pdf
    • https://cdn.shopify.com/s/files/1/0435/0859/6900/files/lawaxuxenojolen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6449/files/lotogilutusikuluwivo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/59924059364.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/basezewatepadigegodud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/kupepojutukem.pdf
    • https://cdn.shopify.com/s/files/1/0433/1605/2123/files/fisanovopov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/tubugi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/lujipigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1234/1416/files/nebolumowen.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_off00007b51.bin
cc58837d36377fc8ed8205eebac80168bf6377b7076aaafecb7f0614be08785c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B51 5300 bytes
font_01_sfnt_off00008d5d.bin
4e5f9f1e2373a110d98357668e107d084d07c95fc4f7f387ceab1f6095da4852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5D 10212 bytes

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