Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc18e6fa7c792bf…

MALICIOUS

PDF

68.3 KB Created: 2020-10-29 09:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43848b7d3f0f9629b8a85292f26191bc SHA-1: b37490fd92bc38f4a614d4767aa6194a3563706c SHA-256: 5cc18e6fa7c792bf28881732e61d1532344bd22649c6bbe0bab50e8c40f02be0
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to link farms and a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to malicious content. The ML classifier also strongly indicated maliciousness.

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/123?keyword=generalized+linear+models+with+r+pdf
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/xigaxikorufaves_ririzizu_xevububu_dumul.pdf
    • https://zumavekuganupa.weebly.com/uploads/1/3/4/3/134366180/650906.pdf
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/titom.pdf
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f8859d683b13.pdf
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/c2b1e37ad.pdf
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/579072.pdf
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f96db5b77fb3.pdf
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5f9277637eb8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxipanovigepiv/puerperal_pyrexia.pdf
    • https://cdn.shopify.com/s/files/1/0266/8940/5126/files/cpcc_levine_campus_number.pdf
    • https://uploads.strikinglycdn.com/files/c4fc3978-bb1b-4311-a21b-5e39647ac45a/electrical_wiring_diagram_software_open_source.pdf
    • https://s3.amazonaws.com/gotijejaj/49243811388.pdf
    • https://uploads.strikinglycdn.com/files/3518a5c9-2b1b-4c5a-8631-2fbf85f4ce38/88293280388.pdf
    • https://cdn.shopify.com/s/files/1/0497/5099/9193/files/divisible_by_4.pdf
    • https://uploads.strikinglycdn.com/files/70b0eaf5-3deb-4704-9d1c-3c8665411eb9/joxaburugonesididapene.pdf
    • https://uploads.strikinglycdn.com/files/42cd8315-f547-4071-8cbe-cb0afcdb3085/lazufod.pdf
    • https://uploads.strikinglycdn.com/files/025b5c8a-0f2d-491c-a4fe-8b58fd54f39c/72440428495.pdf
    • https://uploads.strikinglycdn.com/files/aba17a80-7326-4aa9-801b-826c653d4782/target_bike_lock_australia.pdf
    • https://s3.amazonaws.com/lebaxa/danielson_domain_3b_examples.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/30196392245.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8762/files/rexroth_linear_guide.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000d324.bin
3a8c091b810c37e399487eda892e96acc4eee0b089845aaa5ab8feb0c0642aa7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD324 27476 bytes
font_00_sfnt_off000098a3.bin
3393c57f2a907ba18c0e18ae924a5290e5d06e9d6dfbdb5c8136888076479d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A3 5452 bytes
font_01_sfnt_off0000ab1d.bin
0af0bd28417c5cef084fa4092bd018e64a742a73cbb729db825c9391f93be3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1D 11752 bytes

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