Malicious PDF — malware analysis report

Static analysis result for SHA-256 942523b16138cadd…

MALICIOUS

PDF

35.8 KB Created: 2020-08-22 00:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9d45023225efdd3ad38f90778957585 SHA-1: ff5cbd78cdcd4046f0c82a1daab3ce9828b6415d SHA-256: 942523b16138caddbcf67995e1684c2e7a9200f2d6fb3391c18843ce90ef47b3
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with many embedded URLs pointing to external PDFs, likely hosted on Shopify. The document body contains obfuscated text and the URL 'https://ttraff.com/pify?keyword=beetle+buggin+free' which is identified as a malicious redirector.

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=beetle+buggin+free
    • http://files.hardangerferiesenter.com/uploads/1/3/0/7/130775649/13a654ec05b877.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/89182555212.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/77820033977.pdf
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/muzedunofinetegu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/25686947102.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9061/files/osteoporosis_australia_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/sefikavizedinipirugerifag.pdf
    • https://cdn.shopify.com/s/files/1/0440/5349/5958/files/5889990077.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9970/files/esv_bible_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/39284394211.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/bonafide_certificate_format_for_employee.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/mesemewikusazukakavogube.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_off00004fbb.bin
6c386f8c69b84f5c190c3f0fc7a78cc17c00eb1947c30e27a403cf47350bab57
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBB 4736 bytes
font_01_sfnt_off00005ff3.bin
2c7d9ebe7988d047f9e5af2e15ab76afb379ff7a90de619d15d3a9836e4a3f06
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF3 10144 bytes