Malicious PDF — malware analysis report

Static analysis result for SHA-256 646c0d36e8855edf…

MALICIOUS

PDF

46.8 KB Created: 2020-11-06 01:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4c1e203fb17880244884da02a95e6d70 SHA-1: 4ebe3092011e6eba1d83f681c8bd4d7fe00c6266 SHA-256: 646c0d36e8855edf353b5f4ea12a029c2e761f6f92ead54853109ec62ce24b87
136 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a primary focus on a redirector URL that masquerades as a search result for a game. This suggests an attempt to trick users into visiting a malicious site, likely for phishing or to download further malware. The ML classifier strongly indicates malicious intent, and the PDF structure with multiple external links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=is+there+a+2+player+need+for+speed+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5f97743c2724c.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/tedaxudevu-pizujewupobavek-nililivido-xepogoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f9558d4a8bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_5f8d31bc251d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5f98193289bd5.pdfIn PDF document text
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/2819890.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/wunupalezozerud/20079261400.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/public_speaking_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/justified_meaning_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b89a67-640c-43ce-bdff-21aab0dff69b/wisutodirer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b5ae34-df73-438e-8d79-e7d5ab454500/riwig.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/33045627488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67508269-389d-412d-88ff-e81db1ed5747/2012_mini_cooper_clubman_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/eco_wood_treatment_lowes.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_off000077a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A9 5628 bytes
SHA-256: c9aac7f519be147c37db2b8b8641d08f2699b9f0fdb8cdade5fb5234f870fadb
font_01_sfnt_off00008aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAD 10296 bytes
SHA-256: 599b41c072893e77926bc4611027c497b347530cc338e68c9bf9844889a0738c