Malicious PDF — malware analysis report

Static analysis result for SHA-256 74814c1f9aafcd83…

MALICIOUS

PDF

39.3 KB Created: 2020-08-08 02:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25440dcc69a77cc844fb59d544e7db3a SHA-1: 088125ebf5d7077dcd581ad9408252e81e31064d SHA-256: 74814c1f9aafcd8351c27cf6bfadbd71319de041df82a242f531766550403979
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a redirector service. The document body, though corrupted, contains text related to 'cause and effect worksheets' and a URL that appears to be a lure. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the intent to lead the user to a harmful destination.

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.com/pify?keyword=cause+and+effect+worksheets+7th+grade+pdf
    • http://files.crabbymama.net/uploads/1/3/1/8/131855992/181697.pdf
    • http://files.fusiliersheep.ca/uploads/1/3/1/4/131453990/sevarasekaz.pdf
    • http://files.erathcountyhabitatforhumanity.org/uploads/1/3/1/4/131454238/vizubu.pdf
    • http://files.tutor.ifljumpstart.com/uploads/1/3/0/7/130775102/d29d501d.pdf
    • http://files.betanuomega.net/uploads/1/3/0/7/130775870/xidexiwepal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/50940962782.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/66906496122.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/kezoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/72024191738.pdf
    • https://cdn.shopify.com/s/files/1/0433/3499/2025/files/3527416176.pdf
    • https://cdn.shopify.com/s/files/1/0436/0955/5107/files/centrifugal_pump_performance_curve.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/guretemotunumal.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/historia_de_la_arquitectura_bizantina.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/13294330963.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/ancylostoma_tubaeforme.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0317/files/10393362895.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/afsaneh_najmabadi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1164/files/20946365918.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b07.bin
3ba9ffa00ba3b0dca82c9f8651475b7510348627466b1514391122df539629bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B07 5524 bytes
font_01_sfnt_off00006deb.bin
b005ed44e92c57ec17195dd35512af2c5c07264a5226ce762f669a8c41d071d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEB 10060 bytes

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