Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca5a5a7b51ae5c5…

MALICIOUS

PDF

70.4 KB Created: 2020-09-21 16:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efffef15ea65fcf5f9d24223310b5de5 SHA-1: f9f3e004debdc4f1cfd0c6135418c70d1d740767 SHA-256: 9ca5a5a7b51ae5c5d7c68a8a7805aa133f5902d7bac0c1a62d9c928ec2592383
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, which is designed to lead users to malicious websites. The document body, though heavily obfuscated, contains text related to a 'Viper remote start model 7254v manual' and a URL that matches the malicious redirector. The presence of a large number of external PDF links, many pointing to SEO-optimized URLs, suggests a link farm used for SEO poisoning or to distribute 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.club/wix?keyword=viper+remote+start+model+7254v+manual
    • http://foburege.baldmanandhumans.com/uploads/1/3/1/6/131637291/varaseredu.pdf
    • http://wezawu.futurebanktoday.net/uploads/1/3/1/8/131871426/kotapuwoxux-nenorekedarib.pdf
    • http://xutuzer.amyslawson.com/uploads/1/3/1/4/131406736/zidixizemeja.pdf
    • http://danotor.asalutetoveterans.org/uploads/1/3/0/7/130776394/genusufeb_bodadutaj_bovefelalikez_tetetaruw.pdf
    • http://fojovi.doctorpk.net/uploads/1/3/1/1/131163725/xuropokidubit-jumeribetevamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2011/5358/files/scrum_burndown_chart_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/pesujutozubukaperavis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/27010020330.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/chimney_swift_tower_construction_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/8042/4351/files/buzulugefixob.pdf
    • https://30714097-671c-42cf-91e6-50678fc4cbf7.filesusr.com/ugd/70c1f8_e17fb5ed95f44a9ba980ed0b71ac431f.pdf?index=true
    • https://81740e0a-5024-4c47-9719-505955eaeea9.filesusr.com/ugd/cac9e4_ef330264350c41a1a1b1ac1ab97606cd.pdf?index=true
    • https://df210075-f00a-4696-9eb3-5c0f0d65079c.filesusr.com/ugd/d5415a_246e15601b944eae976415fc5f57b9d7.pdf?index=true
    • https://56c62a06-b7a7-4ce8-a84f-95d7bf890818.filesusr.com/ugd/0d089b_686f10771e1441b29d376d8baa39f026.pdf?index=true
    • https://5106ac56-d726-4aef-8b31-5e7992cff4a1.filesusr.com/ugd/66c878_1f511724f8d04166badb78e35dffe172.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/88584981791.pdf
    • https://cdn.shopify.com/s/files/1/0440/8924/5861/files/bblia_de_estudo_pentecostal_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/derevopozo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd92.bin
dfff1b8370236011d3f6009caaf02bae447253d6467dca265af626f289f74029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD92 5556 bytes
font_01_sfnt_off0000e075.bin
391bee8da9b08db14f1b56331039df6ddaeefcea52d02ca9933473656c1fcc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 13508 bytes

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