Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bffd8602d880c0c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-12 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b97fd194af6c7870e735003567cf918 SHA-1: b4c3c526f78e899eda46dc860f128153c635c35e SHA-256: 0bffd8602d880c0cbaa8fcea40e103ac0aa35b131ccc0cccfa3abca5aee7091d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body and embedded links suggest a lure related to educational worksheets, likely to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=infinitive%20of%20purpose%20worksheet%20pdf
    • http://files.mariaillustrations.com/uploads/1/3/2/6/132681931/86f4c9bb8.pdf
    • http://files.misslaurasladybugs.com/uploads/1/3/1/3/131384335/retujorum-kefuzimelofa-lavazovol.pdf
    • http://files.elpasomobilemechanic.com/uploads/1/3/2/6/132682899/6615113.pdf
    • http://files.modson.com/uploads/1/3/1/4/131438079/sarox.pdf
    • http://files.lemroyaltyfreemusic.info/uploads/1/3/1/3/131382092/4665f5433540e2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/91447952733.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/zujevawopimepolinusutotid.pdf
    • https://cdn.shopify.com/s/files/1/0435/8550/3393/files/mathematical_modelling_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/bimifipukixatotagil.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/99733727191.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4133/files/71512204057.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/69927067093.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/deluxelisataku.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/estadistica_para_negocios_y_economia_anderson_11_edicion_solucionario.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/dinasaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/bomaluvovojow.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4474/files/arusha_peace_agreement_1993.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/rebowe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8271/files/xirufoxonepowete.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000634d.bin
03b787a4c351a4c48190cca85dee66ddfaa8da0345740cba868578bf33adb280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 4924 bytes
font_01_sfnt_off0000741b.bin
e32f34732a41ab9124ac4318213e2dab7a5b0dfe0c46967b2db93c535c1a3fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741B 10612 bytes
font_02_sfnt_off00009844.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9844 4324 bytes

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