Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef117007519767d…

MALICIOUS

PDF

45.6 KB Created: 2020-08-22 21:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed37821f7c03ddc8de620158deec895d SHA-1: 18a87bbf80a4bc7bc63c4f312167ee505a63df63 SHA-256: 0ef117007519767d5a5ec5cec3285e16db5997aa86ef2010255081579133af84
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The document body and heuristics indicate a link farm strategy, likely intended to drive traffic to malicious or SEO-manipulated content. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful sites.

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://ttraff.ru/pify?keyword=halloween+math+worksheets+for+preschoolers
    • http://lumukojoz.zalanfloors.com/uploads/1/3/2/7/132741029/9357be.pdf
    • http://zaxovaso.satcanada.org/uploads/1/3/0/9/130969080/fasezuvezuvonun_jotuxogepe_zomuxunaxofiv_rodugil.pdf
    • http://files.nevergoaday.com/uploads/1/3/1/0/131070523/ruzirevegog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0246/1351/files/50_sombras_mas_oscuras_libro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6354/9845/files/30299047908.pdf
    • https://cdn.shopify.com/s/files/1/0460/8586/5636/files/hsslive_maths_question_paper_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/mukufolowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/57107822799.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/the_reason_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/biology_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/2691/3179/files/c_binary_tree.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/kekesisadifusupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8221/0725/files/vowupupokab.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/zifukixavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/1923686479.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/84040740845.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/assassin_s_creed_apk_data_kickass.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007360.bin
75229ee695c80efa857780ce2cf9819e688c6c89a66ff9cadd819718e87ce216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7360 5372 bytes
font_01_sfnt_off00008589.bin
3c2dcc35ce38da5c0e2893dcc3ada79398009acef519f46f807eb5af60875801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8589 10444 bytes

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