Malicious PDF — malware analysis report

Static analysis result for SHA-256 312e988f21d57dd3…

MALICIOUS

PDF

46.0 KB Created: 2020-10-17 23:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 98ef670937cdb8592cdcc0f8cf4e1b73 SHA-1: a6bd33297d8555f3c5c5872fc6aa0b85a6520158 SHA-256: 312e988f21d57dd37b1e58469d3f47e14e33a84f63c94da89ad5e87ed2e0f27d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with a seemingly innocuous keyword. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or redirection attempt. The PDF structure and embedded content indicate it's designed to exploit user curiosity or search for specific information to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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/strik?keyword=tales+of+berseria+combo+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f87ca08dbd0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f875d10a86ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5f8b1e349b8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f87ada086624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f8863ff700f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f8aec330a442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f89852b98cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f8777a524bc2.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/wotitir.pdfIn PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/tukixofosoleku.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/mezaguwok.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/gupadigewetoz_savaxuxojalazo_vepom_nuxijadavipuwe.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/00fbc26c-fb59-4ac3-96dc-df1363a8f97f/58011058340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73102c6-fdd8-4c13-a6ee-9b38c258ce3c/kupubizixugat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1887a485-a19f-4114-92f0-87dae6555cb7/lopovusapivisinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d919ea-3d75-44a2-9762-27882e6ccd10/zunaduwezunipanamosere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8982/5443/files/audio_cdl_manual_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/9262/3766/files/frog_and_toad_are_friends_the_letter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3497/5639/files/genofagixasuvebapik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8506/9477/files/9585445000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5822/0187/files/lonely_planet_portugal_itinerary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1177/6927/files/area_of_a_triangle_parallelogram_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9462/0333/files/false_cognates_list_english_spanish.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B8 5432 bytes
SHA-256: dad2770c95487872f08fc358ee2a6dc9343b7945241f14aa8634b23c1d10c204
font_01_sfnt_off00008c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C13 10288 bytes
SHA-256: 33d64efddb0b22312a427eb6ccd4525f3d3ac7aaac3195f67bf6ea713f9c6986

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