Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ffadb102cb8aa3…

MALICIOUS

PDF

52.0 KB Created: 2020-08-04 22:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c92e15a4f6b7be98d4a59409855a8b6c SHA-1: ecc94b0ebc6f1fde36d85bb9817a607d321f3ae9 SHA-256: 56ffadb102cb8aa34bca24513f65b8c0092d847301a2dfaee9d1aa009e54fdff
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.com/pify?keyword=major+causes+of+stress+pdf, which is likely used to funnel victims to a phishing or malware 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.com/pify?keyword=major+causes+of+stress+pdf
    • http://files.eurekarestoration.org/uploads/1/3/1/4/131437216/84283ff9.pdf
    • http://files.seaboarddevelopmentcompany.com/uploads/1/3/2/7/132740730/pesaxuvapuf.pdf
    • http://files.virginkidsacademy.org/uploads/1/3/1/3/131381612/niromabasul.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/podenamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9649/7573/files/agrger_des.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/95655156747.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6299/files/53277488466.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/bamemix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2711/files/59205132561.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/tunejeguvose.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/siwuvosekaxalegugo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6679/9766/files/xawatew.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/13181272847.pdf
    • https://cdn.shopify.com/s/files/1/0435/8324/2401/files/57217513904.pdf
    • https://cdn.shopify.com/s/files/1/0448/3717/5456/files/comer_abnormal_psychology_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/ultrasurf_for_chrome.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_off00008e8a.bin
685e6c87a96ed6dd1757b15b7b7cf3fc921ce00fc4c8cde8bdbaabb858a18650
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8A 5200 bytes
font_01_sfnt_off0000a058.bin
c79c74f6f011b982274d3b53ea0c59fb74dd71d27cf8bdf6834ea33820153192
pdf-font-stream PDF embedded font (sfnt) at offset 0xA058 10076 bytes