Malicious PDF — malware analysis report

Static analysis result for SHA-256 589e5b14bf9e40e8…

MALICIOUS

PDF

34.0 KB Created: 2020-09-24 02:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6cad2c1665a99d208d1ffb656300fbc SHA-1: c813f385720547964eb011625f5729b27981aea8 SHA-256: 589e5b14bf9e40e88a5a9bbdf3330e16003bb207de0a2d292ea7bba57c7d1213
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to domains associated with redirector infrastructure or link farms. The primary malicious URL identified is https://ttraff.club/wix?keyword=naming+ionic+covalent+and+acid+compounds+worksheet, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains similar URLs, suggesting the intent is to drive traffic to these malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=naming+ionic+covalent+and+acid+compounds+worksheet
    • http://files.gourmetgarlicgardens.com/uploads/1/3/1/3/131398010/3768119.pdf
    • http://sapulubo.thebarrelhousellc.com/uploads/1/3/2/6/132681670/8695706.pdf
    • http://rifapad.wastecontrolservice.net/uploads/1/3/1/4/131437354/rimuwezere.pdf
    • http://files.regisacademykc.org/uploads/1/3/1/3/131384442/jedesisijaneziw.pdf
    • http://files.yogaatschools.com/uploads/1/3/1/3/131384663/3b9a06.pdf
    • http://files.intoschool.org/uploads/1/3/1/4/131483143/tumidovabar.pdf
    • http://files.dragons-poker.ca/uploads/1/3/1/4/131437276/dafazojukejonar.pdf
    • http://pexinuwid.ccpotters.org/uploads/1/3/1/8/131856127/vojuliwuluvefobil.pdf
    • http://rikunak.lightandmemoryfilms.com/uploads/1/3/2/6/132681293/4c159b905a89596.pdf
    • https://16dda27c-0299-423b-908b-f6c813ea8fb8.filesusr.com/ugd/f68081_c4b54e83c9504450aadc8b67f9d3ef1f.pdf?index=true
    • https://957323ec-5233-4954-a1a4-752a2c6330e6.filesusr.com/ugd/7fedcf_0d3d8e811bcc4c8bbbec0c4de3146aca.pdf?index=true
    • https://91f0a3c3-5b17-4800-bbbb-7bef518d3997.filesusr.com/ugd/432b07_041e82fd51de4e83b69b4f04c3da422b.pdf?index=true
    • https://87ea4e8e-5d23-42c6-86db-280f1a60cf6a.filesusr.com/ugd/dcbeda_3cc1523455c54223be317ccbb5190a60.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_off0000471e.bin
32cd94b4ef56648cabf09e0f18e568a083d8f9a250c16b4d297ffdbbcd59310e
pdf-font-stream PDF embedded font (sfnt) at offset 0x471E 5672 bytes
font_01_sfnt_off00005a62.bin
9484bfa5ea0a5312ae8641b122a39114ecd5890876f2ca6708f0b5487576837f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A62 9548 bytes