Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8766690d29ef22…

MALICIOUS

PDF

42.4 KB Created: 2020-09-03 23:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e953e68329871a0c80e02777b2a6239 SHA-1: 2a797bc34bd525841887449199b3e000110f4433 SHA-256: 4b8766690d29ef22fab636880a659f9e3dec1723981f4aaed1de8777a7b81cc0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body also contains this URL, presented as a lure for a 'free annual credit report'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a malicious link.

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=get+free+annual+credit+report+government
    • https://cdn.shopify.com/s/files/1/0439/2009/7448/files/loziwixezarirumuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2331/9715/files/aditya_birla_capital_limited_annual_report_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/8906/0259/files/netipilakagadex.pdf
    • https://cdn.shopify.com/s/files/1/0429/6799/0438/files/fernando_pessoa_o_livro_do_desassossego.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/aquaculture_farming_aquatic_animals_and_plants_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7930/2296/files/46235335143.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/november_2020_calendar_with_holidays.pdf
    • https://cdn.shopify.com/s/files/1/0463/4653/5073/files/24458514486.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/84134136385.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5125/files/xegabiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/28290737636.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/welunajerotamebimumeza.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/lowajawabunowaravufefugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/zemeziva.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/15663798918.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/supujid.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_off000066b6.bin
6f7898ba0c1163c5234d8842604e1afd7889e98d0151e50b0a03dd97e64e76aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B6 5388 bytes
font_01_sfnt_off00007904.bin
3109b5d24cfcbe22df1b7bbc99fee5d2c877d5d3d95a95de7112d33e45b314e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 10484 bytes

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