Malicious PDF — malware analysis report

Static analysis result for SHA-256 166537ceb1058fc8…

MALICIOUS

PDF

42.9 KB Created: 2020-10-17 07:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 422f7c003816b0975384a042540c47c6 SHA-1: 0cd3228ecc3de252902c298485efa74ce664b446 SHA-256: 166537ceb1058fc8f8be605f451a6a641d45ed318c58dece9fd543406c296cb9
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, disguised as a free download. The ML classifier strongly indicated maliciousness. The embedded links are likely intended to lead users to malicious sites or download further malware.

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/123?keyword=pomology+book+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f871ed1299cb.pdf
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f876d69034d4.pdf
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f88488811ab7.pdf
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f88b08246894.pdf
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8a1830ec342.pdf
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f899e4880f92.pdf
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f875ca846f49.pdf
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f8a659467707.pdf
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f876ef671bc4.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8807a7cc584.pdf
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/ddf57535cf.pdf
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/ac8c8a8.pdf
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/4243524.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/pujosadugebafimeduko.pdf
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/wasexega.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/1887816.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9613a579-bc8a-402f-b246-6ffd34d1dd98/doxadupexegopubofogugikax.pdf
    • https://uploads.strikinglycdn.com/files/e383c5fe-4329-4c35-965d-af5fb55e2846/49966762134.pdf
    • https://uploads.strikinglycdn.com/files/3fe1ac5b-856a-41f9-ac87-ba6d8bb12aa7/xenopa.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_off0000678d.bin
c91355a61c00de93ef867388265abc5418d1833e4316eaf6ece9dbc5ce6f4add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678D 5584 bytes
font_01_sfnt_off00007a8c.bin
925e1c973482682618e5b453c117f501da8580a31b25245aa4d3e9686b115105		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8C 10484 bytes

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