Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2633df312361c19…

MALICIOUS

PDF

43.0 KB Created: 2020-10-27 07:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5902c9e083a339414388fba303686c1 SHA-1: 1768b2f98f35f84c4613a02e72e5302332abe31f SHA-256: c2633df312361c19e3b0728d8ca6a1e791136e9e1fa3a1724a7803b0aafca484
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme designed to lead users to malicious content. No scripts were extracted, but the presence of numerous malicious links suggests a watering hole or redirection attack.

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://gettraff.ru/strik?keyword=mathworksheetsland+distance+formula+answers
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f933cdf81ec3.pdf
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f88a672b548a.pdf
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f86f457325c8.pdf
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f975304c9ff1.pdf
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f89525fb415c.pdf
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/sabelakepusites.pdf
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/nofuxebunem.pdf
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/5dfb506267035.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/kebuw_repana.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dbbd04.pdf
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f90eecb63ad4.pdf
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f901c7e72d14.pdf
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f90df861d72f.pdf
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f8d844fa271f.pdf
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f89ea7c9432c.pdf
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5f947314e8427.pdf
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5f8b90977dce3.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f881090cb5f7.pdf
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f90e5d985d78.pdf
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5f970beb50cbc.pdf
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f8c24f2711ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/56c4c1d9-28b2-42e7-9652-db4934115986/6885062111.pdf
    • https://uploads.strikinglycdn.com/files/dc7744af-15d7-422c-be7b-87c7b737c2b9/moroccanoil_hydrating_styling_cream_walmart.pdf
    • https://uploads.strikinglycdn.com/files/b7bd0efb-9664-451b-a794-d00e56cfd4f3/tesujerukexotumug.pdf
    • https://uploads.strikinglycdn.com/files/edf56a9d-7471-4df0-bd5d-572dbd2281aa/fazedo.pdf
    • https://uploads.strikinglycdn.com/files/4615b302-3201-4e9b-97a7-d2e23ac56d61/551554361.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006614.bin
84a2f4a51e95c3c758e29a4517035b6bc27e9613e8c98069ad69fb70589d16b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6614 5420 bytes
font_01_sfnt_off0000786f.bin
861c118262f94dfe07af20070938f05df02ba97c9cb9f9d40fd89a382498dc91
pdf-font-stream PDF embedded font (sfnt) at offset 0x786F 11364 bytes