Malicious PDF — malware analysis report

Static analysis result for SHA-256 a424f0f7508035e3…

MALICIOUS

PDF

47.5 KB Created: 2020-07-29 07:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eefcf1c54c8f44261741cad067e360b2 SHA-1: 5b95c400a23596875d3dfd3a653cc330243271d8 SHA-256: a424f0f7508035e3e0d6683b83cc508d2ac7c059fc6bda6b3bc93cc1b1b66a3c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, including a critical link to a known malicious redirector at 'ttraff.com'. It also exhibits characteristics of a PDF link farm, with many links pointing to Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users through these links, likely to a phishing site or to download further malware.

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/pify?keyword=best+3d+modeling+software+for+android
    • http://files.fitnessdetermination.com/uploads/1/3/1/4/131407423/f7033.pdf
    • http://files.redhandranch.com/uploads/1/3/0/7/130775484/633508313354c.pdf
    • http://files.allthesangwiches.com/uploads/1/3/1/6/131606133/0f7e91380474.pdf
    • http://files.allthesangwiches.com/uploads/1/3/1/6/131606133/0f7
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/44299479589.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/kalol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/67437721533.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/3916152845.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/43656487624.pdf
    • https://cdn.shopify.com/s/files/1/0437/3702/2615/files/zanivujojegi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9725/8136/files/36648025120.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/jujajaxuwabarazokax.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/gotulakux.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/rojopanakuvuvirediz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/wusenujexegisupoto.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/bovonenejov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/85251214930.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_off00007a69.bin
b6eb73801bbd2cefe006010c2a42acdd65a751e6a10bd30228fc2b6dd3ae4be1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A69 5320 bytes
font_01_sfnt_off00008c78.bin
fc5e07ddd416956f75f8149b369b8d6ec10c2c350f4e7b4e85ba950fd4a448ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C78 10644 bytes