Malicious PDF — malware analysis report

Static analysis result for SHA-256 4105a97d154523fd…

MALICIOUS

PDF

38.8 KB Created: 2020-09-16 19:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a021659871b67df67afb452c6e344e SHA-1: 75ef1b36632de3ec88a361eeb89561b059867a73 SHA-256: 4105a97d154523fdfbbd372d031428865deb4eaeff1b4bb4ef11d43213d7aec8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'adding and subtracting fractions' and includes the malicious URL, suggesting a lure to educational content that redirects to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=adding+and+subtracting+fractions+with+like+denominators+word+problems+pdf
    • http://files.louisewknight.com/uploads/1/3/1/6/131607029/nudilenovumoluw-wofikun-porasego-redidaligaweka.pdf
    • http://files.bluesteeltm.com/uploads/1/3/2/7/132712006/bebogakagi-majemakosoje-nubivel.pdf
    • http://galeza.powerofmath.net/uploads/1/3/1/3/131379478/2050617.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/gcf_and_lcm_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6314/files/64206020748.pdf
    • https://cdn.shopify.com/s/files/1/0486/3324/9960/files/gutitudulapufogaxawilidaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3281/files/making_inferences_worksheet_multiple_choice.pdf
    • https://e810cf7b-3453-48c6-be24-f87e973620e0.filesusr.com/ugd/e50c99_013f08794f23433db659f83010185c7e.pdf?index=true
    • https://aed771f6-45c8-4ee7-bc5c-722fbd453712.filesusr.com/ugd/cacfd7_717ebb85725744ad81b7aed8c4bae983.pdf?index=true
    • https://603c4a1f-2ce0-492b-a0f8-107e765ceadd.filesusr.com/ugd/136d3d_c4c55c50763047ab89d29a4c8d815fd2.pdf?index=true
    • https://343d979d-eaf8-4399-a517-32584ab8fc3e.filesusr.com/ugd/6924eb_a10d91b4d0b442149f0491923573bf93.pdf?index=true
    • https://07bb82b7-bea7-41a4-8c2b-fdaa44a3ef54.filesusr.com/ugd/f459ea_40a21f1953a84bc0a8c9774a77c3bb4b.pdf?index=true
    • https://eb46cd08-8172-42a0-bee7-766b31ff8e0b.filesusr.com/ugd/c79b1c_a9964ae096d34f1eaf714129214a9cc8.pdf?index=true
    • https://fd030969-7c2a-43f1-82ba-f423e691a9c7.filesusr.com/ugd/65e777_69f0ea6633fa402fb1f471175b83f32b.pdf?index=true
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000561e.bin
523f5d739d058d389908853935eea1adcc549170615d0be50b7981210adbbbd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561E 5856 bytes
font_01_sfnt_off000069f2.bin
76c0145d4f33815d05e576e10fa432cfa5b77cdbdaea38841678f0603ac85713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F2 10532 bytes

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