Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cf440f41cee4bb…

MALICIOUS

PDF

43.0 KB Created: 2020-08-06 01:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf4ce8e044ad678596a7dddb9683538 SHA-1: 528f87ef28e0f1cae2e9fdf0995427b07d3929b6 SHA-256: 07cf440f41cee4bb877afd9152c8e600da1b9b6068222ebe868a90ab2156ee42
162 Risk Score

Malware Insights

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

The PDF contains a lure for a free dictionary download, but the embedded link redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic further suggests this document is part of a larger link farm operation. While no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate a malicious redirection attempt, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=oxford+english+english+tamil+dictionary+pdf+free+download
    • http://files.sierrastrange.com/uploads/1/3/1/4/131482975/7221298.pdf
    • http://files.mimiswords.org/uploads/1/3/0/7/130740177/59e4f.pdf
    • http://wijalor.gendiesel.com/uploads/1/3/1/8/131856725/nowawujefo_jufumamepefero_wufule.pdf
    • http://files.whshuskymusic.com/uploads/1/3/1/4/131406960/gujetigenanaz-rifumibikafe.pdf
    • http://files.costellohsie.info/uploads/1/3/0/9/130969143/wipapebagolun-lufoka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/ruby_subtract_arrays.pdf
    • https://cdn.shopify.com/s/files/1/0440/1653/3654/files/disorilezapiteziwojiwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8917/files/37831023412.pdf
    • https://cdn.shopify.com/s/files/1/0440/3331/0870/files/private_security_guard_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/basic_heat_and_mass_transfer_mills.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5424/files/98117159982.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/kujinapegogijusofapazika.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/kasibigewafavi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/61217792695.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/77530855020.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/circuit_switching_networks.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/jibikuziravedagonudim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/kofowazivunobixuzezosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8856/7706/files/catecismo_de_la_iglesia_ortodoxa.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_off00005be5.bin
d8c0998c2b30e253f881ea44c3ffb7cd82ff58bb5d905c465125673cf742ea30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE5 5648 bytes
font_01_sfnt_off00006f0d.bin
87c61327fc6523245a0529518196a2a00a243068b065ea643c7bfbcaeba15810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0D 9664 bytes
font_02_sfnt_off00009034.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9034 4324 bytes

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