Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1e189f97f5f23f…

MALICIOUS

PDF

50.2 KB Created: 2020-09-20 07:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1abc50f3dd85a3a1e98f6a1d1bd86d1a SHA-1: 5cd907907d06b23ac91244f89506a2d9456bb79b SHA-256: 1a1e189f97f5f23f1737309f6ee91be9ac5fdc947c8285496295597b56eb33d4
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious URL, which is likely part of a phishing or malware distribution scheme.

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=manual+reader+crossword+clue
    • http://borumap.viana-motion.com/uploads/1/3/2/6/132683138/livupurikub.pdf
    • http://nejixowej.purvine.org/uploads/1/3/1/3/131398097/mowijo_xadoli_fujagelid_zimigugi.pdf
    • http://toxojebow.ocdmumandorganiser.com/uploads/1/3/1/6/131636698/9aee3f8e93.pdf
    • https://cdn.shopify.com/s/files/1/0432/2908/5859/files/18637823272.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/66161444890.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/pugewusasanoradexetiwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/4281785598.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/bamelemibewavuragoxipidel.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/adding_rational_algebraic_expressions.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9417/files/struts_framework_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3674/files/26937510165.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/71189016186.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7159/files/network_marketing_books_in_bengali.pdf
    • https://98397147-9520-4432-a46c-2ed48c5470a5.filesusr.com/ugd/eb2f7d_c84146f459d24698a165e909aab048d5.pdf?index=true
    • https://783a332a-76ae-47ea-9f24-f1372cd24eb4.filesusr.com/ugd/23e9be_819b9eb6df12434685bd0ef224d464f6.pdf?index=true
    • https://a4b9c6fa-8c45-429d-b361-93f5774d67f1.filesusr.com/ugd/5b1e3c_7749b996fb154e0da55ba4a89239c1b1.pdf?index=true
    • https://b841f801-2b52-43d6-b6b1-9318504db4d3.filesusr.com/ugd/fe83c3_ab3db230629d4f7da36905adca52472d.pdf?index=true
    • https://bd7990e1-dfb5-41cb-a444-f9fd841f68c8.filesusr.com/ugd/0bcf16_197616f663424d918e21ee43fbaf693c.pdf?index=true
    • 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_off000084d3.bin
a62529aa08a25809100030cb09e7d6365be8eafb5ac17a0a9b9560c18cd3d2d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D3 5028 bytes
font_01_sfnt_off00009613.bin
f9b8d0616bc59ad92462e0d7511c8226bf610fe3ba5a9e8d7b2614b8e616078a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9613 11056 bytes

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