Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e5e1aa5e69a743…

MALICIOUS

PDF

40.5 KB Created: 2020-08-05 17:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a52ebdb02965501e0fab0f11b5ec4dc0 SHA-1: 5530610dd43233a8ddf3ae4ead6ef698ef5ae11a SHA-256: 83e5e1aa5e69a7435d6929c77cc42c6e624e6d726f924f316af6c3aa424cc7ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=bmjv+patientenverf%25C3%25BCgung+pdf', is identified as a malicious redirector. The document body, though partially garbled, suggests a lure related to patient information. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=bmjv+patientenverf%25C3%25BCgung+pdf
    • http://files.myphumc.com/uploads/1/3/1/8/131856409/wulipijili-wurubixex-sikifivupi.pdf
    • http://files.happytailsdaycare.com/uploads/1/3/1/1/131163897/jidigike-jizokali.pdf
    • http://files.somethingsoldsomethingsnew.com/uploads/1/3/1/3/131381681/lugibufokobe.pdf
    • http://files.hairtieandpecanpie.com/uploads/1/3/1/3/131380889/509b63902bc.pdf
    • http://files.carlyaltreewilliams.com/uploads/1/3/1/4/131482822/bujiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/zudimebugasabotex.pdf
    • https://cdn.shopify.com/s/files/1/0433/2532/5467/files/jojizagoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1590/files/71049846607.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76640573288.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/pedigefik.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/votiven.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/4698920251.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/85791986486.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/pixuruwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2245/files/68806150929.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/63097201011.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/86563636676.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d51.bin
ce2e098f0b07eeb80c939cf6055545fb5a8a8cf423d85da352d91f3a6462b97a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D51 5456 bytes
font_01_sfnt_off00006fa8.bin
c5e1201c338a9b02dcde3f7069007374aad0b306e6e5855ba84ee4a315612e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA8 10656 bytes

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