Malicious PDF — malware analysis report

Static analysis result for SHA-256 84deba663ee355fe…

MALICIOUS

PDF

39.4 KB Created: 2020-09-10 13:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20fb94d57c01855bdacb9aaea4474cc1 SHA-1: 5d3acb5754a7485c66a5e78e2df85936f618f7b5 SHA-256: 84deba663ee355fe44e4032121623c0dbc2212fa135f448d84a3d31cfbd76ee2
154 Risk Score

Malware Insights

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

The PDF document is identified as malicious due to its structure containing a mass of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary malicious redirector link is https://ttraff.club/wix?keyword=genotypic+and+phenotypic+ratio+worksheet. While many other links point to benign Shopify domains, the presence of the redirector and the ML classifier's high confidence score indicate malicious intent. No scripts were extracted, and the document body is largely unreadable binary data, but the link farm heuristic is sufficient for attribution.

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=genotypic+and+phenotypic+ratio+worksheet
    • https://cdn.shopify.com/s/files/1/0430/8441/5143/files/jijozunofo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5478/2869/files/cafeteria_plan_reporting_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/kimagaguzefir.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/amor_de_verdade.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/36161883130.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://static.usrfiles.com/ugd/4c1554_984b53e629334ab6a496b4cefbc99c70.pdf
    • https://static.usrfiles.com/ugd/7ab50f_271bff0120f842d8b31592c598e76964.pdf
    • https://static.usrfiles.com/ugd/ac0094_8c89dc0c3a954b0c8ecde983e98a85bf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4537/1560/files/13629884116.pdf
    • https://cdn.shopify.com/s/files/1/0435/7931/0239/files/stp_plush_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/rimworld_tornado_generator.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_off00005b54.bin
079db7d3796827425d67f1a673e252de66c796d7f021bfa3dec6c008fa9f109b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B54 5420 bytes
font_01_sfnt_off00006dd7.bin
7cbe5b747bba66e0eee77a400bdeff6f0ce75e82f0ad4a5b606c37a7393e339c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD7 10340 bytes