Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ff180f72e45360…

MALICIOUS

PDF

40.5 KB Created: 2020-08-25 04:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8f18e715bbf8db7d043e2a7469e7369 SHA-1: 3f54ff517d1b35aad838152e45a8af5c12df4bb1 SHA-256: 53ff180f72e4536013b915fb969fcf69968010b5c177176104984c2689e7b990
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 farm with 22 external PDF links, many hosted on shopify.com. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.ru/pify?keyword=garnet+hill+linen+sheet+set`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to 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.ru/pify?keyword=garnet+hill+linen+sheet+set
    • http://files.accfinsoftware.com/uploads/1/3/1/4/131454316/f1f84e0ea2a5cc.pdf
    • http://suziralov.thairicespoon.com/uploads/1/3/1/6/131606490/zalexivet.pdf
    • https://cdn.shopify.com/s/files/1/0448/5254/3649/files/idylis_416709_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/winijopa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/android_studio_documentation_comments.pdf
    • https://cdn.shopify.com/s/files/1/0435/2439/1067/files/pumezeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/2093518526.pdf
    • https://cdn.shopify.com/s/files/1/0432/8108/8670/files/pastor_chris_oyakhilome_books.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/11084858272.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/school_bus_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/46361465232.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_off00005b6c.bin
9962a04d4992f6a1042268e522fe0f4dea95145afc5cd8734308f40dbcf63415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6C 4804 bytes
font_01_sfnt_off00006bb8.bin
e2d170c534887fad4b7f988cfc7be6fe15f438b5a0ce621b549f08446fc26d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB8 13128 bytes

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