Malicious PDF — malware analysis report

Static analysis result for SHA-256 88775673cbf6d3a0…

MALICIOUS

PDF

48.0 KB Created: 2020-10-26 06:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e85bbccf9e28e399d5d04f3c011a3d5 SHA-1: 1b5fbf702c4fbdcc93e5f6cd0c897e3d05a08b60 SHA-256: 88775673cbf6d3a0b82083d9972c5564849a5616b7938112777645ad53f22d9d
154 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classification and heuristic analysis. It contains a high number of embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://gettraff.ru/strik?keyword=soren+kierkegaard+the+present+age+pdf'. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the presence of numerous links indicates a link farm or redirection attack.

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://gettraff.ru/strik?keyword=soren+kierkegaard+the+present+age+pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f88a6033371c.pdf
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f896ddf6affd.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f87aee10fa2f.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f92fecce80fb.pdf
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f8c1bcbd9cfa.pdf
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f871a832b0c5.pdf
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f9551bfc0ae4.pdf
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f8d5f9c2f9e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0499/7559/1074/files/betuda.pdf
    • https://cdn.shopify.com/s/files/1/0465/0768/8086/files/siruma.pdf
    • https://cdn.shopify.com/s/files/1/0466/5281/7573/files/last_battleground_mech_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0500/9991/2869/files/wopefef.pdf
    • https://cdn.shopify.com/s/files/1/0501/6571/1013/files/the_impossible_book_chapter_1.pdf
    • https://uploads.strikinglycdn.com/files/6c2fcfb9-a4d3-4e4d-83e8-2d1a53bddd85/77129141009.pdf
    • https://uploads.strikinglycdn.com/files/4429a806-a20c-48a6-abc8-925352c26909/lalipugivewovanedefid.pdf
    • https://uploads.strikinglycdn.com/files/0dfca7a6-0e22-4bbf-ae5a-1273b67b7d09/kelolomig.pdf
    • https://uploads.strikinglycdn.com/files/7eace738-81f3-4a3d-91e4-2fe38bc9b129/50859104539.pdf
    • https://uploads.strikinglycdn.com/files/6e81b19e-ad96-46e7-ae54-d542b7870b95/6214666374.pdf
    • https://cdn.shopify.com/s/files/1/0266/9238/6999/files/1227981807.pdf
    • https://cdn.shopify.com/s/files/1/0500/5911/6697/files/grade_12_physical_science_study_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0481/2347/8179/files/wejuguxadijozis.pdf
    • https://cdn.shopify.com/s/files/1/0484/9041/4230/files/mitsubishi_air_conditioner_manual.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_off00007a67.bin
b9044b47083983d6f379b854f06c46c9233f4d8a183faba7be60aca6a331ad00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A67 5436 bytes
font_01_sfnt_off00008cd6.bin
375fe950c238557247734ebb9d7b2823b5e89033c40f1333bebfcf8ae1f46172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD6 11084 bytes

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