Malicious PDF — malware analysis report

Static analysis result for SHA-256 5410c1e3c82e4023…

MALICIOUS

PDF

47.0 KB Created: 2020-10-29 12:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dfb4b5d3ebc7598d65717dd9ff10b7cf SHA-1: e509715a96de96006505a6e86d7e5ebd34c4ab66 SHA-256: 5410c1e3c82e40236773466392fd667e211fe814c6f027e80456ca45b8506824
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable hosting services and are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself contains a URL that is also present in the extracted URLs, suggesting a direct attempt to lead the user to external 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/123?keyword=august+15+2020+calendar In PDF document text
    • https://fizozedodid.weebly.com/uploads/1/3/4/4/134484686/434856.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/a285e.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/tuxubafokobu_fixezoxomikadiw.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/roriturosiw.pdfIn PDF document text
    • https://torawatuxopo.weebly.com/uploads/1/3/4/3/134379163/fenewekiloginu.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/kixanimenenoz.pdfIn PDF document text
    • https://narebojabow.weebly.com/uploads/1/3/4/2/134266185/fenisesolebegine.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/zevimolukizo_botodoser_wubezikefiwiwa_rifizasun.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/zazijuvavo.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/wivugome-dirixajev.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/rinedufiwaditarip.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/9927791.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/85d5c88d-36c2-42f2-838f-dbdf2c846ad7/25880104707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6656/2966/files/79991665881.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/fofevubefozavorut.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/59248132539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b27b5ab-d631-4ad5-a656-5ed66212d58a/38285361458.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2492/2786/files/acids_and_alkalis_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9699/0115/files/bilevoxotowepuxejemisa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5837/1009/files/99399620845.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/82750433902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afcc876f-6ba9-4e86-8ddc-9dd362bef552/verubevelasupabujigetif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52ef475-1553-4be2-97f4-4ec43980b021/40704331773.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/arabic_to_hindi_dictionary_free_download.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_off0000786c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 5544 bytes
SHA-256: 18f6ffd9f1037b5ca1296a614923c94d6b1361f5937a9e94e08132168485e573
font_01_sfnt_off00008b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6A 10236 bytes
SHA-256: 0b0c49a3a00bbe869bfcb979eac5a8863c31cc5e78d469b1b2e896b558d65ef7