Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e48da54c93c0a44…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 04:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d003622b0a87ac1910c34706488b230 SHA-1: dba972d6b78053622ccfb3a55ea23d0f67012f8e SHA-256: 0e48da54c93c0a44b97fe2bcd0705b6996971e5fda95a955e60fd1599871dc04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to joining PDF files and includes numerous links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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.com/wb?keyword=join%20pdf%20files%20c#
    • http://files.parkpostoffice.com/uploads/1/3/1/4/131453592/3767340.pdf
    • http://files.geyserlandcatclub.co.nz/uploads/1/3/1/4/131453034/gabiruremuzamef.pdf
    • http://files.selplasticpallet.com/uploads/1/3/2/3/132303229/bitizugele.pdf
    • http://files.mcnamaragypsies.com/uploads/1/3/1/8/131871902/5867189.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kawovuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/soboxotamosozupebivir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/gepitilusenopekinupu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2103/files/jowuwabojejer.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3511/files/32021800453.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/rusonifabulexiwegejabaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/95525362406.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/40472155678.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/10711925173.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/86233300856.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/baldur_s_gate_ee_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/zalerubatakiloka.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/wufupitibegenavokiw.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_off00005d6b.bin
2bba545d1da81f1c9c87a9d6ff5c067b8bdcb5f91ee178e4c7bfe36520d46532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6B 4832 bytes
font_01_sfnt_off00006df0.bin
21d289b3f753674bf119b63b2c62a98482044bce760ed817688384a3d6e96121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF0 12656 bytes
font_02_sfnt_off000096d7.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D7 16312 bytes

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