Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3488fb9df1c75e3…

MALICIOUS

PDF

36.5 KB Created: 2020-10-25 17:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f5e884730ea696660181f9340e181a3f SHA-1: e662707250eceba824e251e3d5ffa4fcb3d9aff6 SHA-256: d3488fb9df1c75e32bf582eeef0c309f5e3f708ce3a3908f2edd9eefd2e8e03d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting services and at least one known malicious redirector. The document body itself is largely obfuscated but contains the URL 'https://gettraff.ru/aws?keyword=basic+aerodynamics+pdf+download', which is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=basic+aerodynamics+pdf+download In PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/59b5b52f68077.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/8553712.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/toniviboful.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/letekigu.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/fukotagij-kebewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f90386fab9c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f8b29c123160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f94a861ed369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8ef4195e838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5f8c0b0aa7120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f8a0e9dbd0e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8bf365e9602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f94cee1114de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2915/0882/files/wazotagokomukogudoledaxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1597/6613/files/tajarosoniremivodafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2382/5578/files/juratowegili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6656/5023/files/el_santo_rosario_meditado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7277/7109/files/guwowiporewaso.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/ceidg-_1_wersja_1._8._8.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/xuletezuniboladevevutitum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0dbb83-11da-4138-b03f-f0394b3dfe21/79059492435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f3e352-63f2-4cd6-897d-a22e577a81e1/korean_bdo_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98448750-ac16-4a1d-accf-b7d8f592c510/guxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77238005-2a1d-434a-ba1f-a306576deac3/lebekorisamebesen.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5006 5544 bytes
SHA-256: e88d1474c69482f719c4e0f600b67dcd0466e54b62adff379e2ab42f972bb490
font_01_sfnt_off000062d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 9912 bytes
SHA-256: 040df404bb6394879a32c52b610394b90c552f8c6660bb6edb836fa5b1ab865d