Malicious PDF — malware analysis report

Static analysis result for SHA-256 a773377644d8472a…

MALICIOUS

PDF

36.5 KB Created: 2020-10-28 12:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 04f370ea2e12d5e58eab2e50410afb93 SHA-1: 9e5bbdf8ae7683bd3dd8b7bd02a0fcb4692aabf2 SHA-256: a773377644d8472a86b9189d60be5c7b57dab76412660bffb6fe9bb6b494358b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating a redirector to known malicious infrastructure. The document body and heuristics suggest a "free download" lure, which is a common phishing tactic. The primary IOC is the redirector URL used to funnel victims to potentially harmful content.

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.cc/123?keyword=dc-3+stps+2019+editable In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_5f93f14cbbb31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5f9030cf69336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f8f6d80b036d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_5f99363cdc512.pdfIn PDF document text
    • https://fufosasoxesa.weebly.com/uploads/1/3/2/7/132740234/7993796.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/vuvapusuvefu.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/27633fa7578c.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/zuxadol/79448230620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11eb06df-ffdb-40ac-8a23-2d7462c446cd/virufojipesokepedoguzup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5ffd88-962e-4128-9277-ca5625e0cc06/astm_d_1238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1828ccec-5a10-4198-b021-b3e0ad896feb/52279460690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4841882a-ed3e-4b9b-a5c3-ec8d6c3dec66/42993130652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77dfeff3-8451-48d0-82b3-1f241cb9ab55/para_que_sirve_foxit_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785c98e4-174f-42c8-a0fa-ef1b0912975d/animal_magnetism_osrs_quick_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e61a23-5e4a-4043-9bc6-88b52eab6d4b/watch_new_moon_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6808beaa-168f-48f3-8016-bf83739d2f6f/tajalavojoduxajoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6974f037-097c-4aa1-92c2-2d68e35606c1/salefoboxexomelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7d47c2-52eb-4a86-aa2c-a538578242c2/90180559834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3f07b6-9b7b-4f35-ba94-faeb601b70d2/38550438418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db85e0c1-1397-4412-9be4-9a72c5ebe962/8346786284.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_off00004cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CCA 5788 bytes
SHA-256: 8d1795115b4f4c8a9efbaf64eb74500747db965b9d4f274085832ed1cfb7e040
font_01_sfnt_off0000608e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 11416 bytes
SHA-256: f9c1e168c28d452792c42a04041b5acbfcc3cc2cd80e7559a91c6ea9780ea359