Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5df0873a6f6cc5…

MALICIOUS

PDF

42.2 KB Created: 2020-10-21 11:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0955060cceee422af6dc914d931f10b1 SHA-1: 568d88ed91c2b48461b7656ad18c7b90cfe30e5d SHA-256: de5df0873a6f6cc57cd7756d821a646d87fc031fa05bd7bed312bede7c276ca6
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the document's primary purpose is to lure users to malicious infrastructure.

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://cctraff.ru/strik?keyword=tableau+charge+admissible+lamell%25C3%25A9+co In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f8ee072d5274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f8d672c24cbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f877fc51811c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f899e5e12529.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/29515c17a0.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/dadijex-mubolideremom.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/dopud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62267db7-8475-4a11-8928-af56a088598c/pelexidiwekawemok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafd74e8-9478-4bff-b151-e8af054e1d18/horizon_zero_dawn_datapoint_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec32f12-bca6-47ec-970f-e48788a63939/98749862982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd74693-d672-4589-9631-bfd1dea53e82/prodajem_stolarski_freezer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/8984/6168/files/tikatoxalukobose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1485/2255/files/anneliese_the_exorcist_tapes_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/in_mrp_parts_explosion_refers_to.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/accounting_golden_rules_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9933/2516/files/navy_uniform_regulations_boots.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4060/2269/files/tw_fb_lite_gold_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9266/3702/files/41360918886.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/definition_of_curriculum_by_experts.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/siforem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 5584 bytes
SHA-256: 97b31c4669ce680cf5f84e28d116ec28ccb88cfb25209516bdb8838f8ac691be
font_01_sfnt_off0000751d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x751D 10332 bytes
SHA-256: 19edafb5f1ada10b58d1634a3964e4d10b80b215641ed7164c66a36d95dc3099

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