Malicious PDF — malware analysis report

Static analysis result for SHA-256 1217f666f46c6493…

MALICIOUS

PDF

41.0 KB Created: 2020-08-03 21:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4566b1accdab19370b8b4f8d197141 SHA-1: cf9db4cf953652bede37d34e58effcf50ab5cd15 SHA-256: 1217f666f46c64935fce61a7acbb436a56c8317f42e6700286b7c8143b8798e4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a dictionary and URLs, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm designed to redirect users.

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=bicol+tagalog+dictionary+pdf
    • http://files.prssasdsu.com/uploads/1/3/1/8/131856991/441816.pdf
    • http://files.uofttalks.ca/uploads/1/3/1/4/131453429/2382ace.pdf
    • http://files.huemine.com/uploads/1/3/2/6/132695994/1ccac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/jazesufefamemiwu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9442/3192/files/71324223041.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/25267965197.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/causes_and_effects_of_overpopulation.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/bomuvobezuvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/29369326769.pdf
    • https://cdn.shopify.com/s/files/1/0437/7057/7045/files/drastic_ds_emulator_aptoide.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0294/files/ski_santa_fe_weather.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/kogotuwunazub.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/ravoropupapive.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/19220303767.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_off000061da.bin
74fc06387727d3f3191c4b5f1e4625f55d61750494f9689434f39065384c31fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x61DA 5296 bytes
font_01_sfnt_off000073fb.bin
b99fb7cbad2fe82ac648504736904ed0a408fa5d80e0c5d5838cd4d8ff1b5553
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 10372 bytes