Malicious PDF — malware analysis report

Static analysis result for SHA-256 157be8d2c2b2549e…

MALICIOUS

PDF

46.7 KB Created: 2020-08-20 03:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab53ff4dddd894ee48139bca3aa338c4 SHA-1: 852fcbaf0bc877b9836b5eff49639a5e1f109ad8 SHA-256: 157be8d2c2b2549e952b8279408a31e1b246bde7e68e74ccfde78ee4668c58ce
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 heuristic specifically identifying it as a PDF link farm. The primary malicious URL, 'https://ttraff.ru/pify?keyword=bridle+verb+form', is flagged as a redirector to malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=bridle+verb+form
    • http://novizuw.delanomassey.com/uploads/1/3/1/0/131070604/bb48e43a33b.pdf
    • http://files.thebellhouse.info/uploads/1/3/1/1/131164488/pobodukego.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/20105305661.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/7281595437.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/55192284899.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/pekoxemonim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/53640745926.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/putepipavanetikelanelat.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/rukejenewaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/53375625470.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/auto_service_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/ripolekaxoge.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/situfoboli.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_off000062ed.bin
fc53e3803147d8b72fd1520733ba9d5d2b2c0b945446fa73eeb2630f92ef80f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 4912 bytes
font_01_sfnt_off00007395.bin
ddf4961f41c7a3c80109bce99b274037672dfdecb895db3c077ed32a3c2242b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7395 11028 bytes
font_02_sfnt_off0000991e.bin
660d05b38fea380e8cc13f4a5a7db764e9bd2a20a73145a73af50c118749f22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x991E 16060 bytes

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