Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d8dfda06830e32…

MALICIOUS

PDF

45.5 KB Created: 2020-09-03 06:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5badad118e298082466007f2c7b9000 SHA-1: e6e73d35854264237fc2d06685b184fa792896fa SHA-256: 38d8dfda06830e3253cffb014ff5dc5bd62f2c621fe9a93d67ba9729d38cdaca
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a gourmet restaurant menu template. The PDF also features a link farm pointing to numerous other PDFs, likely for SEO manipulation to increase visibility. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the embedded URL is sufficient to classify the attack.

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/wix?keyword=gourmet+restaurant+menu+template
    • https://cdn.shopify.com/s/files/1/0432/9881/6160/files/13798932523.pdf
    • https://cdn.shopify.com/s/files/1/0435/5083/4847/files/rifuwamasudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/bharathiar_university_mba_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8171/files/rukufisig.pdf
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/58778754844.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/plantronics_backbeat_fit_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4758/files/brother_printer_driver_software.pdf
    • https://static.usrfiles.com/ugd/cd1d52_f7b50e6143ae4259976210a434c14102.pdf
    • https://static.usrfiles.com/ugd/432b07_8873201bcbb2444b9030702615203086.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2391/files/memogutepida.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/41799709514.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_off000075e1.bin
270ea73722193bc41d6789dfee5c8b6ef94fe489f88910cf9078d037d358ce19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E1 4996 bytes
font_01_sfnt_off000086c7.bin
335a34c74af45a24ec92c6f71eb51b648eb96b965d092a969332690773585d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C7 10132 bytes

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