Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e28bed34895e142…

MALICIOUS

PDF

47.5 KB Created: 2020-08-11 18:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b876fa17bfc9a328be65c39eb99d4b1 SHA-1: c4ae649eac5ab1138bacfa0e9e7cdaed40ad115e SHA-256: 6e28bed34895e142a02e4c2d518fd8defa1205b6766350a13f47569ca7157f0a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. The presence of a large number of external PDF links suggests a link farm, likely for SEO manipulation 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.com/pify?keyword=descargar+numeros+romanos+del+1+al+5000+pdf
    • http://files.lab302.net/uploads/1/3/1/4/131407274/gidumovuva-goxuvima.pdf
    • http://files.biodiversitygardening.com/uploads/1/3/1/4/131438142/varesotumaki.pdf
    • http://files.sjmsperformingarts.com/uploads/1/3/1/4/131453984/41b9bc01e3b3712.pdf
    • http://files.serenity-gbd.co.uk/uploads/1/3/1/6/131637419/6028597.pdf
    • http://files.tyrendarraagriculturalshow.com.au/uploads/1/3/1/8/131856446/demumesegafudu_wikuzow_tifizu_papafewekib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2338/2174/files/29467121782.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/functional_training_routine.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/noxixazepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/double_column_cash_book_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/20753334534.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/knee_pain_exercises_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6599/files/60839112617.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/it_gets_worse_shane_dawson_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/a_bronx_tale_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0437/1841/0394/files/level_5_the_body_penguin_readers.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/ganiwesebip.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/mixixedobejegidemipetuwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8086/6197/files/9265076550.pdf
    • https://cdn.shopify.com/s/files/1/0431/1636/3927/files/world_important_days_in_sinhala.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_off000079e9.bin
adb078d30f36ebbae7a6ab9e5325d8e1b644b1625d33347526d5884b9f70adb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E9 5792 bytes
font_01_sfnt_off00008d8a.bin
5273cef28e1398a718beeb7a2a9a38dd58b071a9fb6e887c4dd592130d1bae78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8A 10640 bytes

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