Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b186555e89f0e2…

MALICIOUS

PDF

42.6 KB Created: 2020-09-07 05:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8ae2775911a19c8048db0d394153c35 SHA-1: 3eafcc0cae42e662bc5532974604f975fa987aff SHA-256: 91b186555e89f0e289512a6fa0a48e914c304f113f879d01db6c6a589f80ff0b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/wix?keyword=14+gauge+ms+sheet+thickness+in+mm'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the target URL, suggesting a lure to a malicious site.

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=14+gauge+ms+sheet+thickness+in+mm
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/31695303257.pdf
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/continuous_distillation_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/2896/2715/files/budanumurafekelezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/javascript_games_tutorial.pdf
    • https://static.usrfiles.com/ugd/03a576_e1b4e88162ce40ed81c38c4cc5954f73.pdf
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/sobalirowamaxogujus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6929/2188/files/14320357938.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/call_of_duty_apk_data_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/6611/2662/files/70564008346.pdf
    • https://cdn.shopify.com/s/files/1/0433/5003/2549/files/tawutegimuselopetipa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/rexuworoletokufakuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/50577275120.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/37476715595.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4409/files/46918240716.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/89782681732.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_off00006271.bin
0d561d003fe136823d1227078d077eafe6bb0a4a08d55094bcc74d0a8ea2b03c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6271 5196 bytes
font_01_sfnt_off0000740a.bin
9da00cb12804b5ab59c3ff604fc4f46d5790f4e6210c4481bf134d999d11cb0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x740A 13152 bytes