Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bfd9addc61b05f…

MALICIOUS

PDF

35.1 KB Created: 2020-04-19 02:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 727149f94d3818e155eff16fadb6b205 SHA-1: 63fdb9182ab0a092e999eafbdcf96474facab395 SHA-256: 65bfd9addc61b05f8bed87576fd86c14119afaac5a55f2e4a9ac65b6443f178b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a deceptive purpose. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text mentions 'photo roulette android app', which may be a lure to disguise the malicious nature of the links. No scripts were extracted, but the sheer volume of external links points towards a malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://microsoftportallive.net/uploads/1/3/0/4/130478566/130478566.html#photo+roulette+android+app
    • http://ariseconference.ca/uploads/1/3/0/4/130483204/pupeso_menadanijil.pdf
    • http://customcomputer.shop/uploads/1/3/0/5/130541600/fepujijedurur.pdf
    • http://hampshirecars.org/uploads/1/3/0/7/130738970/8408338.pdf
    • http://youcansport.com/uploads/1/3/0/5/130544091/d69cd0073.pdf
    • http://elybana.com/uploads/1/3/0/5/130589416/3a6cf50762285a.pdf
    • http://teq-enterprises.com/uploads/1/3/0/5/130547659/jizif.pdf
    • http://dashinglyonline.com/uploads/1/3/0/8/130874211/6aaac541.pdf
    • http://novaeq.com/uploads/1/3/0/2/130287920/f316313.pdf
    • http://rocklanddoula.net/uploads/1/3/0/2/130287284/261864.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://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_off000045d5.bin
3e6b4f6871dd6816c04d09133b5b1aa4c60ac2a22f27d62317b3142ffc3d110c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45D5 6156 bytes
font_01_sfnt_off00005e8c.bin
be7acebb918112476a9f8536c0cb22409c8d798b2d409f02b21d7c591f3c0a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8C 2496 bytes
font_02_sfnt_off00006970.bin
70028cb1415871f93c500add91977c47be0542d8bee798040db87ea9a6986b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6970 16544 bytes

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