Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6af5c4c919a09c…

MALICIOUS

PDF

40.6 KB Created: 2020-08-15 07:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce242ae76a24a5556691de03969ac2fe SHA-1: 9fd1b904368206f21343b7e1c64135636a528e6e SHA-256: 3a6af5c4c919a09c67d162dd145741bd811216f13606c7ec0277ad322ab1c5dd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify and other domains, suggesting a link farm or redirection strategy. The ML classifier strongly indicates maliciousness, supporting the attack pattern of luring users to external malicious sites.

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.com/pify?keyword=bass+fishing+guides+on+chickamauga+lake
    • http://zusox.vtfarmshow.com/uploads/1/3/0/8/130814328/2307159.pdf
    • http://pegukufex.shopteambros.com/uploads/1/3/1/8/131857920/f3b183f69f9.pdf
    • http://files.rusticdesignsflowerfarm.com/uploads/1/3/0/7/130775997/femojiwotefa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2703/7336/files/chiari_malformation_caused_by_epidural.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/50463787110.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/13684727074.pdf
    • https://cdn.shopify.com/s/files/1/0434/4535/4658/files/acet_application_forms.pdf
    • https://cdn.shopify.com/s/files/1/0434/2684/0737/files/zejeroparikenotumebafo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/refuni.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/18159063048.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/80040003883.pdf
    • https://cdn.shopify.com/s/files/1/0440/8757/4678/files/julalabajekumativofimav.pdf
    • https://cdn.shopify.com/s/files/1/0437/4603/3818/files/u_satyanarayana_biochemistry_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/aula_internacional_1_libro_del_alumno_free_download.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_off00006163.bin
4a21bdabec4d1a353cb44cf3c8440f645a09d26a786a6eb3ef92f48dacb90a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 5452 bytes
font_01_sfnt_off000073bf.bin
9e94b06e59cbfa59cd02c1db9e3a280f5872de47caf82be607fdea79f447ebef
pdf-font-stream PDF embedded font (sfnt) at offset 0x73BF 9928 bytes