Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f74cb5e81e409d…

MALICIOUS

PDF

36.3 KB Created: 2020-09-17 10:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 121e78d421c6fdb1977cee4df6d6953e SHA-1: a395672cfd044e3a6a8846e00b4009a47d03c29f SHA-256: 41f74cb5e81e409d1f5bdcb0d395190490375586f968b3b91a9881651c761dc8
152 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 Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.club'. This suggests a phishing or scam attempt where the user is intended to click the malicious link. 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.club/wix?keyword=oak+creek+storm+baseball
    • http://files.sigmazetacouncilsc.org/uploads/1/3/1/3/131383384/06071370.pdf
    • http://keges.handsinpresents.org/uploads/1/3/0/9/130969723/gulajipogixokux.pdf
    • http://gupekaz.summitatrailroadsquare.com/uploads/1/3/0/9/130969465/4017617.pdf
    • http://waxar.blurbox.net/uploads/1/3/0/8/130874655/kigamor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/jebigetejukali.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/9032720138.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/nikinonab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/cara_membuat_soal_di_google_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/jenageguz.pdf
    • https://07790026-fc73-4a53-bd77-16991ec1336c.filesusr.com/ugd/fb5067_d494449ea67c495cb59af087e9a5bfdd.pdf?index=true
    • https://bff600fb-c2e9-419e-a356-269ed3d78a19.filesusr.com/ugd/8a4248_92012e4ac50f443a90572fa95a61d6c0.pdf?index=true
    • https://220d0dd3-de22-4ae8-b72b-577d50f14bad.filesusr.com/ugd/0ebc1f_885d0de1b0904418a319b726b6c5e502.pdf?index=true
    • https://791b6e59-819a-4c7c-b901-dca3a3c86ba1.filesusr.com/ugd/ab922d_0af3e48325a341ed949d9306c1154cc5.pdf?index=true
    • 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_off000045c2.bin
98e2bd66cb8e3a95bdfe423a349817a0f1eacd8bb116468f74da81e16a3c7514
pdf-font-stream PDF embedded font (sfnt) at offset 0x45C2 5176 bytes
font_01_sfnt_off00005747.bin
59d879413d2ca237abda68a9b8f6a329ea1df27217017727bf2066a9208700e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5747 14060 bytes