Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0036bf35c9ae69…

MALICIOUS

PDF

43.4 KB Created: 2020-10-31 04:22:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9dbfbb80262b23136e2e06394d0fd3a SHA-1: e672130ce20e33790efafde551ad18209db781ca SHA-256: 3b0036bf35c9ae69a7e237cc04feedc7d834432dc7af2340d25d83ddc7be85c8
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector infrastructure, indicating an attempt to direct users to malicious content. The document body, though malformed, contains the URL 'https://cctraff.ru/aws?keyword=plus+size+petticoat+australia', suggesting a lure related to online shopping to entice clicks. The presence of multiple PDF links and the ML classifier's high confidence score support the malicious verdict.

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://cctraff.ru/aws?keyword=plus+size+petticoat+australia
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/ac0523e2.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/dd7d9b2b6c1.pdf
    • https://wilixutisew.weebly.com/uploads/1/3/4/0/134095986/ribazo-nijasap-mozotonexenar.pdf
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/zusarel.pdf
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/gerujopap.pdf
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/pabuju.pdf
    • https://foduzivanikatik.weebly.com/uploads/1/3/4/4/134492938/6085832.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/dd3f1dad-cddf-4fe5-90eb-6d28d180a65f/fusurijiregubevisidedu.pdf
    • https://uploads.strikinglycdn.com/files/e2ae3ae5-b0d8-4962-a28e-9db6ef630a39/download_bbm_apk.pdf
    • https://s3.amazonaws.com/zoromexemuzid/puzib.pdf
    • https://uploads.strikinglycdn.com/files/6e06c513-d625-4305-bea5-7150d3aec56c/mawozapasagada.pdf
    • https://uploads.strikinglycdn.com/files/1a71e316-6d74-40f7-bbe1-e450d40a22dc/26821726743.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fda.bin
52542bda0c9799f7357210016e87ae0f98ae3bfb17d08750ab8dadec992ea234
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 4752 bytes
font_01_sfnt_off00007012.bin
0e60c0650e276e17806b82c17344ceaca4ba61009d55780b9dc2d9df7aecd6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7012 10016 bytes
font_02_sfnt_off00009265.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9265 4324 bytes