Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b58273cd848954…

MALICIOUS

PDF

39.2 KB Created: 2020-08-20 05:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f8ee0f26c8493a77fc89ac41163126 SHA-1: 6e37e35907c413ab3a90fe178ba7a9bf8e54b4a3 SHA-256: 96b58273cd8489544976079839e93c8537c67240cf5df054268e06d6e474d503
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=cheddars+restaurant+nutrition+information' which is flagged as malicious. The presence of numerous external PDF links suggests a link farm intended to distribute malicious content or engage in SEO poisoning. No scripts were extracted from this sample.

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=cheddars+restaurant+nutrition+information
    • http://files.childwonders.com/uploads/1/3/0/7/130775398/a7c6c.pdf
    • http://files.fiddleonthefarm.com/uploads/1/3/1/4/131408100/5296344.pdf
    • http://files.bdtcentre.co.uk/uploads/1/3/1/6/131636814/318803.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/98393256283.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/87319361660.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/bangla_itihas_boi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9282/6528/files/94138666893.pdf
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/fugovafojazawabite.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/govopoketaripuxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/80577663871.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/61965524912.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/moseju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/xikozo.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_off00005c45.bin
9dc9124d65b46305322139fdcde775d1c0b4754d312733746b2ff7420b4d061e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C45 5020 bytes
font_01_sfnt_off00006d2a.bin
d786b67f89fe54afbb30a302341698cf150040e7f3b10689efcb23f8aef48d54
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2A 10220 bytes