Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa937307d06706be…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 00:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8d14ffd98c8d8ec2542265ffdf01c7b SHA-1: 582efb12fcc394171b5774fd135f461ff2fbdba2 SHA-256: aa937307d06706be225629f2ada8c364a229bab0d2f574c8f2788280eb779bfa
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic indicates the presence of a PDF link to known malicious redirector infrastructure, specifically 'ttraff.me'. Another critical heuristic identified a PDF link farm, with many links pointing to shopify.com domains. The document body contains text related to 'managerial accounting' and the URLs suggest a lure to download related materials, which is likely a pretext for the malicious links.

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.me/wix?keyword=managerial+accounting+garrison+14th+edition+solutions
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/2473864172.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/43400487275.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/56662024749.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/simanowoxevu.pdf
    • https://static.usrfiles.com/ugd/b8c837_b224d8e76dea45cda904ec41700dd946.pdf
    • https://static.usrfiles.com/ugd/b8c837_683867d6f6ab4a2c85a21c86e6755aee.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5b62454bc6f48cb9e2f2105fbeffaeb.pdf
    • https://static.usrfiles.com/ugd/10e3af_7c7cf59187d142f1bb0f52d3d5641b56.pdf
    • https://static.usrfiles.com/ugd/b8c837_026f840908d74eab9d7d60ded1dfcd08.pdf
    • https://cdn.shopify.com/s/files/1/0434/1396/2919/files/callan_method_book_1_stage_3.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/html_calendar_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/gafejolamiba.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/59626840539.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/79625380981.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_off00005b76.bin
dba83a8a6135f65978485ff85a4e240e4e29f4815a22892e3f54f05631c12d9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B76 5348 bytes
font_01_sfnt_off00006d9f.bin
2217235668bbfc71b5def0a01a99694a954a83dadc2ba90394886b15ed8f06ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9F 12996 bytes