Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cd507ebc25a590…

MALICIOUS

PDF

49.2 KB Created: 2020-10-31 06:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 4e1aa9b720bcfdd8881d212c87ace6c4 SHA-1: fdffeae577f3ab14ad54d2bb0775865030a2c0dc SHA-256: 44cd507ebc25a59026e6e63f3ccb50883f23491cb1bcf97f8535b5f43956454e
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=rudram+chamakam+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f97818526555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8a70ae690e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f98039b63ce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8d67dbb6c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415527/normal_5f9a87766727f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_5f9a90fd52781.pdfIn PDF document text
    • https://joweralifaj.weebly.com/uploads/1/3/4/3/134350132/6977621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_5f9c9eebf2484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupuso/48759584622.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/94451952274.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/gemelemumafevoximulep.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/47266448283.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/45783285263.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/gibenozidiw.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_off00007f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F57 5380 bytes
SHA-256: 7a1637c0186145808f9d80f5f47ee1f0483e7efd434946599ad93fca57435000
font_01_sfnt_off00009193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9193 11396 bytes
SHA-256: ada21dbf49473de2e2f0c58b1b97291215970893421a2c9f9222bd5a96960c4c