Malicious PDF — malware analysis report

Static analysis result for SHA-256 8693daba7d473cc6…

MALICIOUS

PDF

44.4 KB Created: 2020-08-14 15:39:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc64655e26228adc9ac06d92f59dd00c SHA-1: b29cbad988bbe86d87cf48525993a0daa166d4f5 SHA-256: 8693daba7d473cc6ffe0336eb6195dbe3dab4255fc3049a9ae9e5d30da7fbc95
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains references to these URLs, suggesting an attempt to drive traffic to 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.cc/pify?keyword=cover+lagu+hanya+rindu+della+firdatia
    • http://lavajok.contractresource.net/uploads/1/3/2/8/132815933/gaxijisoga.pdf
    • http://files.stopglobalwarmingdaily.com/uploads/1/3/0/9/130969176/suposepixizovozidid.pdf
    • http://files.ectrojanbands.com/uploads/1/3/1/6/131636642/notidipijude.pdf
    • http://files.activitymatterslab.org/uploads/1/3/0/8/130813841/5426210.pdf
    • https://cdn.shopify.com/s/files/1/0431/0050/4217/files/sims_3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/52324550813.pdf
    • https://cdn.shopify.com/s/files/1/0429/2493/3283/files/diagnostico_comunitario.pdf
    • https://cdn.shopify.com/s/files/1/0437/2129/3974/files/al_seyassah_newspaper_kuwait.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/67323787362.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/nimididok.pdf
    • https://cdn.shopify.com/s/files/1/0437/2588/1498/files/29672500904.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/18339800158.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4717/files/5800536178.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29529942485.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d67.bin
3135a6578c8a83334fb98080c8a70437bdda675a740c5b5ba7632de439cd451f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D67 5060 bytes
font_01_sfnt_off00005ea3.bin
4c248a6830a2ddb6bd6009422fa78c18aa68756e70857b2a950dc9964f170b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA3 9920 bytes
font_02_sfnt_off000080e3.bin
f04fb96856fa86c99babb5bf309615b780632e07d2318923ed038a7bfd4fd4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E3 16204 bytes
font_03_sfnt_off00009611.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9611 4324 bytes

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