Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b996b2c8c50300…

MALICIOUS

PDF

43.7 KB Created: 2020-08-21 16:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d709321c6c0ce3911fa548cdeee1290c SHA-1: 9148b560845a25f879069962c3abdf4fd14393ff SHA-256: 19b996b2c8c50300492644b2ff6fdcc90fed6336810eb4a007463f6d29b8c67c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but also includes a critical link to a known malicious redirector at `https://ttraff.ru/pify?keyword=secondary+amenorrhea+causes+pdf`. This suggests the document is designed to lure users to malicious infrastructure by appearing as a collection of legitimate-looking PDFs. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=secondary+amenorrhea+causes+pdf
    • http://files.joshuaarguellesphotography.com/uploads/1/3/1/4/131453215/ledibejuvawezexulo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/66690859548.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/13160268948.pdf
    • https://cdn.shopify.com/s/files/1/0429/3256/8220/files/a_retrospective_on_the_bretton_woods_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/96925983315.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/pebetumakekuvupiwojefoxid.pdf
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/art_of_argumentation.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/vazavuxikovukutobinago.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_off00006cb3.bin
8df8bbfa31b8974eb98a08365ac0cfc1b6cf066bcc893810693b791fc307723c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB3 5568 bytes
font_01_sfnt_off00007f6e.bin
e3c4d87e608f0d6db6ff902dc528bc846b0ce9edafc5f14463cc5eb163d65e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6E 10292 bytes

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