Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24aa381fc490c28…

MALICIOUS

PDF

46.2 KB Created: 2020-07-30 12:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ece24a5cc2db3d899fcfbdcd8e8c0e49 SHA-1: ad4084747db613501a2574011beac10aca4e6fc4 SHA-256: e24aa381fc490c2859f40b64ba92e52fc543b5771d8404c0bde6987607ec236f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, indicating a link farm designed to drive traffic to potentially malicious sites. The primary malicious URL identified is https://ttraff.ru/pify?keyword=candide+pdf+resume, which is likely used for phishing or to serve further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=candide+pdf+resume
    • http://files.realgoodhome.com/uploads/1/3/1/4/131408117/powijekizuzamewaboj.pdf
    • http://files.adamisbitsky.com/uploads/1/3/0/9/130969703/5124593.pdf
    • http://files.intuitivemew.ca/uploads/1/3/0/9/130969077/b02aa93.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/sawisipufigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4044/files/xodukixaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4764/0469/files/98701904491.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/vuwojuvu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1571/4469/files/gexesujezakirizokomapis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/nuwin.pdf
    • https://cdn.shopify.com/s/files/1/0429/8761/8463/files/86061821695.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4366/files/13666650250.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/jevevexifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/80520128322.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/filutabiveposefef.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/
    • https://cdn.shopify.com/s/files/1/0440/1571/4469/files/gexesujezaki

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007724.bin
18a0955ebbee4ac44566dc28bec1e7713e2cad0d94a736569fe8f832e3e614ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7724 4872 bytes
font_01_sfnt_off0000878f.bin
83581a9bb516335136e9826e0a956cd4eeeafa6d98c79f1fed611c1909071593
pdf-font-stream PDF embedded font (sfnt) at offset 0x878F 11064 bytes