Malicious PDF — malware analysis report

Static analysis result for SHA-256 056a4af49dac3bdc…

MALICIOUS

PDF

40.2 KB Created: 2020-08-24 05:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da660d2ee75cca188472615d5405362b SHA-1: b615894eb36da37c40a8557b9c6ff22e70fbe66d SHA-256: 056a4af49dac3bdc8e757010c6270485288644c120c46e0f857e796f7316ac04
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one pointing to a known malicious redirector at `https://ttraff.com/pify?keyword=perimeter+of+rectangle+worksheet+3rd+grade`. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on Shopify, suggesting a link farm or content distribution strategy. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=perimeter+of+rectangle+worksheet+3rd+grade
    • http://files.atlanticjewellery.com/uploads/1/3/0/7/130776590/41baab.pdf
    • http://files.dollslakesidebb.com/uploads/1/3/1/4/131454345/35e5401a80894.pdf
    • http://files.andreavytlacilova.com/uploads/1/3/0/7/130738918/fubosager.pdf
    • http://files.spaghettifactory.net/uploads/1/3/0/7/130775665/f8b350f6736ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/57052216499.pdf
    • https://cdn.shopify.com/s/files/1/0439/4598/4158/files/37853418631.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/rososejivazajidifofetegax.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/69959918278.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4504/files/21118895354.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5624/files/sales_contract_agreement_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/3396/0341/files/new_emotional_status.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/aging_process_definition.pdf
    • https://cdn.shopify.com/s/files/1/0440/1093/0341/files/kikenewuvopopixatimeguzub.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6330/files/92672872745.pdf
    • https://cdn.shopify.com/s/files/1/0432/6401/6539/files/blessed_redeemer_sheet_music.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_off00005e1f.bin
2946f87cfa3af33093da05178ced2dee7c341b22d08d01b4dfd87df05f13b4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1F 5756 bytes
font_01_sfnt_off00007192.bin
aabfd8a35a98f41ee429e650e8d183a5e730795bc664dca29a8e693ac29991b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7192 10028 bytes

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