Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee4b6d3d250a1e8…

MALICIOUS

PDF

44.3 KB Created: 2020-08-31 21:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f190170acf7638376518f848b2f1e8cd SHA-1: bac1527aa71feec42e0bf0b12f38648f1ccff5e1 SHA-256: 4ee4b6d3d250a1e82bc47d1d45f2b561a3f0f6c07e915b873d282bbd7217d093
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=boney+m+songs++daddy+cool'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, also contains the redirector URL and several Shopify links, suggesting a lure to external content. The primary attack pattern involves redirecting the user through malicious infrastructure.

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.cc/wix?keyword=boney+m+songs++daddy+cool
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/69403884864.pdf
    • https://cdn.shopify.com/s/files/1/0437/8319/2738/files/vetirutenesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/13828102455.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/lopoxuxafed.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/678280754.pdf
    • https://static.usrfiles.com/ugd/b8c837_cac89a27fce747b0a6f67eab3ad22d83.pdf
    • https://static.usrfiles.com/ugd/0047a4_a90ebd5836c9410099a98a28df81585b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b30317aaa5564d66978070745cb83036.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/wapadopijenos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5243/3557/files/lesefebimusadiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/16468672627.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/70524136808.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_off000067e6.bin
02e38b787616f6fd40e8db1bd5bce3e0763cbc9ff0637c83fb2adece2ec39c35
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E6 5316 bytes
font_01_sfnt_off000079f8.bin
fa158d0cd2bf9a651205f8a91e7b1b0642ba484d77a9c4e991403d798cb31d51
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F8 13540 bytes