Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da123b338f96583…

MALICIOUS

PDF

39.6 KB Created: 2020-08-06 18:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9baba4e62fab6b26536635f8a9c5e56c SHA-1: 7a4638cdffc8c11302146e1397382109a49639a6 SHA-256: 4da123b338f96583f12f6825213ef40554c9471439df54759e448c73a986648b
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to 'https://ttraff.cc/pify?keyword=etiology+of+tb+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs hosted on various domains, indicating a link farm or redirection attempt. The presence of a malicious redirector suggests the intent is to lead the user to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=etiology+of+tb+pdf
    • http://riwewel.victorylifechristiancenter.net/uploads/1/3/0/7/130738714/2975251.pdf
    • http://files.ldfestival.com/uploads/1/3/0/9/130969682/xojofitutiv.pdf
    • http://files.clearhrsolutionsd.com/uploads/1/3/1/3/131398250/rifet-zabaza-saretemufiwigo-gexegukux.pdf
    • http://files.heelingjourneystherapies.com/uploads/1/3/1/4/131407857/morotituguvowufokepa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/61544771965.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/lemufatutajonibolab.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/sexenepebilamiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/8121/8710/files/givubedor.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6510/files/nozuxamavugixexozino.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/xinomipiduvapubel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/nizatadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/jiraworebuza.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/ganupatuxinuji.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/design_patterns_in_swift.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/13260044066.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_off00005e89.bin
bf0830f5227d29b2d4be5e3afe19f1a9ea164b0c813c73465ee62d8e5d7b8310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E89 4924 bytes
font_01_sfnt_off00006f6f.bin
3651fc13222f00fe7e9a5a1fe1c4cb72007ab20872425847702803fd42cfcd35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6F 10056 bytes

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