Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87b2c16922004de…

MALICIOUS

PDF

44.5 KB Created: 2020-10-22 17:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 773af2c825b6431ca37f1b20a1a2e596 SHA-1: 9fd0d455198092456706474b5a4cd9b916e06cd5 SHA-256: a87b2c16922004de79ca2fe862704c6bd178794fdd951fba148a6f82efa193a9
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO link farms. One of these links, https://cctraff.ru/strik?keyword=videozal.net+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25B8%25D0%25B5+%25D1%2581%25D0%25B5%25D1%2580%25D0%25B8%25D0%25B0%25D0%25BB%25D1%258B, is identified as a known malicious redirector. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=videozal.net+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25B8%25D0%25B5+%25D1%2581%25D0%25B5%25D1%2580%25D0%25B8%25D0%25B0%25D0%25BB%25D1%258B In PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/wasabuwemomipov_wivol_kuzuredovoruri.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/1196878.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/124b884337150.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/puzigikufazosi.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/6770779.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/zozetexojepav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5252/6489/files/towuroxegodivobanafaze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4014/4058/files/cv_responsable_commercial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7778/7548/files/sign_into_apple_id_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/case_study_on_product_design.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/combine_and_split_files_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/50298657767.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/ley_de_elecciones_primarias_en_bolivia_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8294/3131/files/how_to_draw_anime_clothes_easy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8373/6238/files/vocabulary_workshop_level_f_unit_3_answers_completing_the_sentence.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/vaneliv.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/magisterium_3_bronz_anahtar.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/pekirumokib.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/tazaxeb.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_off0000660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 5648 bytes
SHA-256: 49ed1d30aa97a421e033acc002cb7bd47cebd4b25491a8adde1fa056a6b70ce1
font_01_sfnt_off00007884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7884 13180 bytes
SHA-256: 6e676c15cd02cee59182625cb03d49e6c4fa6df6be217fbe8d42235f6738eb08

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