Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1b8101707576c3…

MALICIOUS

PDF

44.2 KB Created: 2020-08-07 01:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08c7e6b0105a8cd10ab594ebd821a68b SHA-1: 7f799c2e994f1c7c4bbf29b1e64337e5918a02c0 SHA-256: 0f1b8101707576c34b4414ab27b4f4ca40c19b0444b95707f0232e9b4f52dfd7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.com/pify?keyword=chemistry+text+book+class+11+pdf`. The document body also contains this URL and numerous other links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning attempt. 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/pify?keyword=chemistry+text+book+class+11+pdf
    • http://zobotibax.dumassevents.com/uploads/1/3/1/4/131437363/xumitifibesumir-xixojo-kibupufa.pdf
    • http://puxapo.heavenlytouched.co/uploads/1/3/0/7/130775735/6b58717d.pdf
    • http://files.garealpropertylaw.com/uploads/1/3/0/9/130969742/nesefomamalemesamubi.pdf
    • http://files.powerofplaywilmington.com/uploads/1/3/1/3/131398334/gomotefadusiji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/18404027061.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/mind_body_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0430/9529/4105/files/importance_of_communication_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/wigawarirosuramojabiwenux.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9402/files/paleo_diet_food_list_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/85820232791.pdf
    • https://cdn.shopify.com/s/files/1/0439/8209/4494/files/42032125361.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/football_world_cup_2020_fixtures_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/vafakojazedomapodasupal.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/veguvoturabafolonove.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/20305300647.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f64.bin
de69ca30de39a1ef7518ab47e79a368f5db2dea9175d0e2e07d18d867fafbbaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F64 5728 bytes
font_01_sfnt_off000072bc.bin
68fa358dc821cd0acd7a6f7b947d2690f8ba1dcaadd9d4bfad38965fe814b8eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BC 10464 bytes
font_02_sfnt_off000096c6.bin
8caf45783560910e2ac530005a2528f93f2c4e62936b4d787b7c222dd2e7ae21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C6 3260 bytes

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