Malicious PDF — malware analysis report

Static analysis result for SHA-256 4333249c63ea0be6…

MALICIOUS

PDF

49.8 KB Created: 2020-08-09 12:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d09cf27dd764cbfa6c73e7025e22c13b SHA-1: bb8d21e2c86ac6dfee4a725de824ce38c73817ef SHA-256: 4333249c63ea0be6a725d153b9f66feb9d479384907f08115184aaee7775c222
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of numerous other links to external PDFs, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination.

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=multiple+regression+analysis+in+spss+pdf
    • http://files.nswoysters.com/uploads/1/3/1/3/131380600/4193466.pdf
    • http://jurezife.cropmarksprinting.com/uploads/1/3/0/8/130873995/radema_fogexos.pdf
    • http://files.momentsintheword.com/uploads/1/3/1/6/131607310/5769930.pdf
    • http://zutuni.brooklifestudents.com/uploads/1/3/1/4/131407995/9615859.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/antiviral_drugs_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/63844216752.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/55536769972.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/31481366376.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/fugudilizurav.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8922/files/convert_png_to_svg_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6813/files/33808971590.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/30019380028.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/36777550344.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/cacahuates_garapiados.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/73931683174.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_off0000834f.bin
9c3ac4c9a4d7d39bb5d39cfb02a88a6251451fafd784df8909ed00b0ec6e1788
pdf-font-stream PDF embedded font (sfnt) at offset 0x834F 5316 bytes
font_01_sfnt_off0000958a.bin
a679a56811180495d9484dba601cac7961d38cad01e3af151ba2ec882fb6177b
pdf-font-stream PDF embedded font (sfnt) at offset 0x958A 10552 bytes