Malicious PDF — malware analysis report

Static analysis result for SHA-256 73680daa30829ae1…

MALICIOUS

PDF

46.5 KB Created: 2020-08-07 02:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05194211cb450b231621a8f9627c6b71 SHA-1: 1d4e1afd07f0bb5ed13184f3ecd07d0ddb6eb6bf SHA-256: 73680daa30829ae1bd108c10b69e0a5b99d9cc3309c9809f108b328cc65ea49e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to 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.cc/pify?keyword=bible+modern+english+version+pdf
    • http://zukowuvus.sailingtojessica.com/uploads/1/3/0/9/130969465/401695.pdf
    • http://files.josephine-reynolds.com/uploads/1/3/1/4/131453214/sefevologeduw.pdf
    • http://files.gbcsolutionsgroup.com/uploads/1/3/1/8/131857565/009837b6a.pdf
    • http://papeli.quailhollowfarmpygoragoats.com/uploads/1/3/0/7/130775195/8979128.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajafaliwufenosikem.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/toro_recycler_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/booty_workout_plan_at_home.pdf
    • https://cdn.shopify.com/s/files/1/0450/9509/2376/files/formwork_for_concrete_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2045/0972/files/jekimivobinifubejufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/76894921436.pdf
    • https://cdn.shopify.com/s/files/1/0432/3278/8648/files/hierarchy_of_needs_a_theory_of_human_motivation.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/definition_of_digital_literacy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/rekuxudekoxuwukivarejeso.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_off00006a8a.bin
a09988b76fdb4dfd2195568da154e4dba21f3f1294d5473845db28147a47f32b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8A 5204 bytes
font_01_sfnt_off00007c02.bin
573403e23a2d0b8e51bb716469bbcadd11295c41c084289fe66b275feabe63c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C02 10124 bytes
font_02_sfnt_off00009e92.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E92 4324 bytes

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