Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3974109ed810ec1…

MALICIOUS

PDF

41.9 KB Created: 2020-08-14 04:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e02f2d67b0f59551791b184b45e712ab SHA-1: 01ddd880c9bc344e969ad8c75eee08c1ff859b69 SHA-256: b3974109ed810ec1e04a4e0af6e3ed8fdb68b055701e4ffc35a5012e2ec62dde
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm or redirection scheme. One prominent URL, https://ttraff.ru/wb?keyword=robinair%2034700%20parts%20manual, is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to a 'Robinair 34700 parts manual', suggesting a lure to disguise the malicious links. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=robinair%2034700%20parts%20manual
    • http://gonujin.karolenakuhn.com/uploads/1/3/1/4/131483083/4716a3c0e0c.pdf
    • http://files.bradfordscholarship.org/uploads/1/3/2/6/132681456/5622002.pdf
    • http://files.aloenottingham.com/uploads/1/3/1/6/131637168/murulalirovotefexise.pdf
    • http://bedeziku.office-alliance.com/uploads/1/3/1/6/131637354/deraxonafegitulox.pdf
    • http://files.dreamcollegedisability.org/uploads/1/3/0/9/130969724/xuparoz_gesusukoje_wapasune.pdf
    • https://cdn.shopify.com/s/files/1/0433/8152/2599/files/92105016155.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/towog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/32010575567.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/architectural_graphics_ching.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/nikakefexixojapodoxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/vezujozawalifejopesoviz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/31103223222.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/weranewusudomezun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/vamesivolaliwurubova.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vabagibad.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/gidoxidim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/lapefikirajipipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/biology_book_of_class_11_12_in_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/zepobenuruvonisatadis.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_off000063c0.bin
296f771dac69f12605658e87ed78f4dbe34dc83689ed67ec1becdcb4d6f8b912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C0 5584 bytes
font_01_sfnt_off0000769e.bin
e90ec357eff8699d690816412b880ad26983a8e0c0f33871bd6f9db719486063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769E 10756 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.