Malicious PDF — malware analysis report

Static analysis result for SHA-256 016b4fe850aff128…

MALICIOUS

PDF

41.0 KB Created: 2020-08-06 23:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 096fa8c4ac15d32a9142c224d9551320 SHA-1: 373b233f979e7f229a6a4d6e1d020a8ee52a9d9c SHA-256: 016b4fe850aff1288411a18a70b875ff5d5cccd6f7460fa50c4651a3e2fbd989
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The document body contains numerous URLs, with the primary suspicious URL being https://ttraff.ru/pify?keyword=acids+bases+and+salts+notes+pdf, which is likely used to redirect users to malicious content. The presence of a large number of embedded links suggests a campaign to distribute malware or conduct phishing attacks.

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.ru/pify?keyword=acids+bases+and+salts+notes+pdf
    • http://files.academyonegoalkeeping.com/uploads/1/3/2/6/132681664/3856476.pdf
    • http://files.sunshinestudiosonline.com/uploads/1/3/0/8/130815277/f13e5.pdf
    • http://vakabi.faubionmiddleschool.com/uploads/1/3/0/7/130739553/479404.pdf
    • http://files.termarkleather.com/uploads/1/3/2/6/132682665/85b01c3aa355523.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/kobra_red_dot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/96545628902.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xarapidarobumebavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3463/2607/files/fuxawulamuxixopufipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41230052817.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/70500979863.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2954/files/fisigogowewokokeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/89704608751.pdf
    • https://cdn.shopify.com/s/files/1/0435/9946/2558/files/revistas_arqueologia_mexicana.pdf
    • https://cdn.shopify.com/s/files/1/0433/5062/2358/files/best_books_to_read_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/nulitilugoguforomib.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9065/files/vizolowa.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_off00006352.bin
e0b273250c9a0a1e45502daa213e2ed24dd0958a484aae0ffe892368c23ac774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6352 5184 bytes
font_01_sfnt_off00007509.bin
d28685cbc7f205a8a926517beda39e90ef14f9edbb2b29f992ad43c950acaf43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7509 9964 bytes

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