Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a20c28054b60f1…

MALICIOUS

PDF

40.8 KB Created: 2020-08-13 10:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88a94d2b6fb713b34156e55459b3d583 SHA-1: 1284877197d38b5eee8296c8984f59b06869ab00 SHA-256: 68a20c28054b60f1d5721f1afaa9085ebcbbc90a2b0f5906e5742dae22af4b88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the same URL, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness. The presence of a malicious redirector link suggests an attempt to lead the user to a compromised site or a phishing page.

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.ru/wb?keyword=5%20star%20hotel%20brochure%20design%20pdf
    • http://files.ritaonrealestate.co.uk/uploads/1/3/1/4/131437806/fozoxokovonivad.pdf
    • http://bodulixem.psucusa.com/uploads/1/3/1/6/131606490/lokuxujimujujuta.pdf
    • http://files.farmnecktennis.net/uploads/1/3/0/7/130775310/kazezamonefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6018/9594/files/91447601180.pdf
    • https://cdn.shopify.com/s/files/1/0443/9523/3446/files/malcolm_knowles_andragogy.pdf
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/low_roar_bones_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/ludiruxe.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/nenuwafakijigeroporez.pdf
    • https://cdn.shopify.com/s/files/1/0432/1889/5010/files/kelas_amphineura.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/totumifigebi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/new_functional_training_for_sports_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/2860/9186/files/basketful_of_moonlight_workshop.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/11951123537.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/43885002021.pdf
    • https://cdn.shopify.com/s/files/1/0429/8270/3257/files/cerebral_contusion.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_off000060e8.bin
c34ad6c0af632dd1762a5da57c47673c209bfdaa2a92ec0761bd4b942a3bffc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E8 5584 bytes
font_01_sfnt_off000073d8.bin
59bc47e8030578556b6743b09b3f5584d330b153d1ce57210b19844146d4106b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D8 10116 bytes

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