Malicious PDF — malware analysis report

Static analysis result for SHA-256 810f47c7631e894d…

MALICIOUS

PDF

57.0 KB Created: 2020-08-21 16:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 15c217772d5bacf3c2475e15e5ecd358 SHA-1: 6d76a60312ad9b0b5c279a87759833832a4cd273 SHA-256: 810f47c7631e894db1f3111af85f3f83213cae57a364b41857fef1c8cd753fe0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'Autodesk inventor tutorial pdf bahasa indonesia' and a URL that appears to be a lure. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a malicious redirector.

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=autodesk+inventor+tutorial+pdf+bahasa+indonesia In PDF document text
    • http://files.noahsarkquarryville.com/uploads/1/3/1/3/131383924/gaxosatel_bizufodalug_vukupuxemazof.pdfIn PDF document text
    • http://files.b-star.org/uploads/1/3/0/9/130969384/jekibezatetirepiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2738/9851/files/17910768225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/4948/9308/files/zizopemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/behold_the_dreamers_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/easy_brain_teasers_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/college_physics_2nd_edition_knight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/plastic_sheet_extrusion_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/algorithms_for_interviews_github.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/california_real_id_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0190/5315/files/master_sanitary_fittings_price_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/biological_nanomaterials.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/13048428222.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 5264 bytes
SHA-256: 017b1f3cc2eb2ca9a0090fa3259158d66fac695d959cedb3f7185572293dc1fb
font_01_sfnt_off00009b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B37 14720 bytes
SHA-256: fcf2e83f2d6061f068a018ef8125c1f2ede2c9d5deae73385b29514e411f4bfe
font_02_sfnt_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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