Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdf1daaed767b06…

MALICIOUS

PDF

54.2 KB Created: 2020-07-31 07:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 686e09d4f669c7a40278c4c0ca57a37e SHA-1: f3f8cf36e4fc97cc0b38aef77ded38635722a72f SHA-256: 0bdf1daaed767b069d29ac9dd3e3e0fcfd1b7edfa9cfa2d1f5b79d024948ce29
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded links are the primary attack vector.

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=calibre+de+conductores+y+su+amperaje+m%25C3%25A1ximo+pdf
    • http://files.abouttimeband.co.uk/uploads/1/3/2/3/132303010/motajepenirejo.pdf
    • http://files.fallonsdailytoast.com/uploads/1/3/2/6/132681769/9429494.pdf
    • http://files.greenstonedesign.co.uk/uploads/1/3/2/7/132710772/da6b85c.pdf
    • http://files.lcol.org/uploads/1/3/1/3/131398497/d86a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/5803121410.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1520/files/89997657029.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jazaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/lidularetu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1688/6184/files/nusuxasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9602/2933/files/womitegejefokupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/52608816218.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/puparijobamepef.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/nunaxove.pdf
    • https://cdn.shopify.com/s/files/1/0431/0682/8441/files/81067329866.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/genugadukol.pdf
    • https://cdn.shopify.com/s/files/1/0428/5598/9404/files/76261045308.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/85729976513.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/57346768863.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000797f.bin
9e5f318f0484c79de217cac80a23b3b8f4207a2111f9946a27cdb1dbb2a82fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797F 5824 bytes
font_01_sfnt_off00008cb5.bin
accd65e60875447a437357259d506119dd24a22a1ea063281c03d1471ed65b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB5 11652 bytes
font_02_sfnt_off0000b253.bin
b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 16312 bytes

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