Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f531810fa85ca98…

MALICIOUS

PDF

81.6 KB Created: 2020-08-07 23:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c5eba65249d766fd25adfbd76d7e0ab SHA-1: 45b2cd9631c481c4e972d4be88f0e077c2efc9c8 SHA-256: 5f531810fa85ca98124ef29002be61b484c3c9954d4608711fdb52b9c10edda9
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that likely serves as the initial lure. The presence of a password-protected archive lure heuristic suggests a multi-stage attack where the user is prompted to download an archive, which is then protected by a password provided within the document.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=ecologia+humana+y+ambiental+pdf
    • http://files.mariposa-design-events.com/uploads/1/3/0/7/130739308/basegadawipujir_rivojeperugu_juwikilafaga_kafagufubulabu.pdf
    • http://files.angelajullings.com/uploads/1/3/1/3/131398498/sowoxew.pdf
    • http://files.apafss.org/uploads/1/3/1/8/131872087/piguw_xoditixaxibafe_xapavo.pdf
    • http://files.unclebobsbugbgone.com/uploads/1/3/2/3/132303230/d5b7d8bc8e4f44.pdf
    • http://files.afsardmdlab.com/uploads/1/3/2/6/132681758/nesefiwo_ruvezojetuz_pijasij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2723/2918/files/2310349082.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/89379115109.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/vojevuluwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4453/6473/files/37510628757.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0523/files/dns_codes_for_gta_5_1._26.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9018/files/62358962003.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/lawedijisazegokuforamag.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/duwopiwexuruduzirofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/arraylist_big_o.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_off0000fcdd.bin
90a26e5f4a2ac24fd96f19beb6d8e230eeb350be7f51c8215f091aae452d9fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 5492 bytes
font_01_sfnt_off00010f76.bin
e69db410821dd7510bd01c25575251885d2d2261c3675bfb614075b65c58d936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 12352 bytes

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