Malicious PDF — malware analysis report

Static analysis result for SHA-256 327102b5bfdc1b32…

MALICIOUS

PDF

46.7 KB Created: 2020-11-04 02:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 77d8d22df3cea77869b99be0081617da SHA-1: 42349c763291dbba4c1ea1d097ebc27aae685b08 SHA-256: 327102b5bfdc1b32267a6296f66450bf5100eb50d9de418df5bac22289f34108
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link that redirects to known malicious infrastructure, disguised as a product advertisement. This technique is often used in phishing campaigns to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/123?keyword=kubik+evo+8gb+mp3+player+with+radio In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f94f1e5c5712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_5f9bc30c30c55.pdfIn PDF document text
    • https://fiwenozagor.weebly.com/uploads/1/3/4/3/134363395/nefiwajufapir-vagulof-lotoko-resuripova.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/xivoxosetozug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5f9cfc81a266d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da1f821-e06d-4268-b74a-b3e37f0dd0e9/65453044877.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/fegup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75179195-e575-422e-ae24-7b4f2cdca98b/pevibedigazemojaxukujok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c094f6d-3caf-4ca9-965b-a8a2098e5691/recycling_sign_number_4.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/the_great_panchatantra_tales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde9aa5e-3b70-4813-9482-a4c125adef8f/15795395969.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/zevemugoliwubazegawezo.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/strength_of_materials_singer.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_off00007450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7450 5980 bytes
SHA-256: edabdc8885402938ea9dbd63197873ca5d8038ace1dcd41e484182692c03f4b6
font_01_sfnt_off00008894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8894 11020 bytes
SHA-256: b5366b27a11bfd2baf32544dfeeebe350173a578ec51ed7bc430d8fd1f259b3b