Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fd05c70a543e85…

MALICIOUS

PDF

43.7 KB Created: 2020-10-31 13:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d552f23c296520f30e55ec1f56ba1a SHA-1: 751b9e84641912050d87c916c077c853b3618595 SHA-256: 29fd05c70a543e85b63713f6b11360c6d308397fdb724f1e64a99dcb431a1e18
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, https://cctraff.ru/aws?keyword=chunky+knit+yarn+bee, is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the document's purpose is to redirect users to malicious infrastructure. No scripts were extracted, but the presence of malicious links is sufficient evidence.

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=chunky+knit+yarn+bee
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/nojilu.pdf
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/5616485.pdf
    • https://vuwejugo.weebly.com/uploads/1/3/4/3/134309576/potasamo.pdf
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/danezozeto.pdf
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/sizuko-madifedam-tidaperitoso-susolepifipebap.pdf
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/jarekinaku-puzavekawav-tezodabigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0496/5944/5405/files/80796363496.pdf
    • https://cdn.shopify.com/s/files/1/0500/4931/9075/files/globocan_2020_breast_cancer.pdf
    • https://uploads.strikinglycdn.com/files/1914a59d-c308-4cfe-ab8f-970fd82da4a2/yasin_suresi_arapa_yazl.pdf
    • https://cdn.shopify.com/s/files/1/0507/1123/2701/files/45899593061.pdf
    • https://uploads.strikinglycdn.com/files/98cd1cf0-1092-4d0e-a76b-c3592bae1e19/el_reino_del_dragon_de_oro_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7295/files/sinogovaxedizinez.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6564/files/zizaxuziwupodowe.pdf
    • https://cdn.shopify.com/s/files/1/0503/3495/7762/files/30901324291.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_off000070a7.bin
54afd816c2232b0f6ab2b51807864e88982e52fb17b32af35481b871b2f2e9e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A7 4772 bytes
font_01_sfnt_off000080e0.bin
88de1b9fdc2d40353a8c8c4841c7d994ffde8aee2b92fd346b4bc93a4a87309d
pdf-font-stream PDF embedded font (sfnt) at offset 0x80E0 10072 bytes