Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c225b721ac72d45…

MALICIOUS

PDF

49.1 KB Created: 2020-10-31 22:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 85bb98b485ce9da4cb785c5873e6764f SHA-1: 3bcbfdecbdbc4b7b81df67aff146f82021f8e3fb SHA-256: 8c225b721ac72d45c1ef48dd4c7f994376865ab09d047601b65b171fa3f4a4d7
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, many pointing to S3 buckets and other benign-looking PDFs, but also includes a critical link to a known malicious redirector at `https://ttraff.ru/123?keyword=heard+it+from+a+friend+lyrics`. This suggests the document is part of an SEO poisoning or link farm scheme designed to funnel users to malicious infrastructure. 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.ru/123?keyword=heard+it+from+a+friend+lyrics In PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/4703932.pdfIn PDF document text
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/gazip.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/6651550.pdfIn PDF document text
    • https://mupawume.weebly.com/uploads/1/3/4/3/134365579/5709263.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/belapigojat.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/kavitokolezub/47887335054.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/64405129119.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/panasonic_es-rw30-s503_opinie.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/how_to_find_oblique_asymptotes.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/jurnal_sejarah_agama_hindu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec363fe-8f50-427c-ba96-54dd1062145f/cloze_ing_in_on_science.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/31666968859.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/7545/0046/files/audible_vs_scribd.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/kanalemu.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/sajapusufizamug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2825/0276/files/afk_arena_vip_level_location.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_off0000827b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827B 5228 bytes
SHA-256: 1a23a4e45c697799a4e6ea77cf1ecf62a20b90a87b0e607c85517159a2034094
font_01_sfnt_off00009438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9438 10388 bytes
SHA-256: a5f2645e710764642a41ed2ea88dd106468ad3d6c303d79afa243d4266288967

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