Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38a036c3ff85ac0…

MALICIOUS

PDF

39.8 KB Created: 2020-08-17 13:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2778d1091d4b0a636c58be31756439e SHA-1: 5e5e526ede00222d4fd32a630b877ea25ff73f34 SHA-256: e38a036c3ff85ac00e5436a309e8fe9bcca81a06f9322ecc723dad9945a2897d
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=calculus+purcell+9th+edition+pdf', is designed to appear as a legitimate document but leads to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely to manipulate search engine results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=calculus+purcell+9th+edition+pdf
    • http://files.omanroadshow.com/uploads/1/3/0/7/130776841/kasulojemuv.pdf
    • http://files.greatlakescockapoos.com/uploads/1/3/1/1/131163904/nagamuw.pdf
    • http://wukeni.robinlewismusic.com/uploads/1/3/0/8/130814110/33243.pdf
    • https://cdn.shopify.com/s/files/1/0449/2269/9943/files/84203535019.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/roxebajiwapabamaranufej.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/aprilaire_600_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/12650795884.pdf
    • https://cdn.shopify.com/s/files/1/0432/0123/3053/files/48491946107.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6534/files/buy_california_king_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0443/6099/0876/files/bsnl_prepaid_karnataka.pdf
    • https://cdn.shopify.com/s/files/1/0437/8119/3885/files/nuevos_antidiabeticos_orales.pdf
    • https://cdn.shopify.com/s/files/1/0435/5856/8097/files/vudesazugoxelajezam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/48262243196.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/63689734493.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_off000053b6.bin
3b55512219b2abddb35a1d135c81ce8aa8b3dd5424896f45fd0015fa540541ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B6 5304 bytes
font_01_sfnt_off000065b6.bin
dd64e32e5be482a7e7491f5e8e6b1a7ba2256649858a70fe381ce315afb4d0f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B6 14252 bytes

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