Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3cf797a76e5166…

MALICIOUS

PDF

46.5 KB Created: 2020-08-31 18:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 977c5961008da754922ebf5b23bf1f80 SHA-1: 06f6ce6d429ec9459f4bd947f561e04223ad5293 SHA-256: 0b3cf797a76e51663b673795c7427e1bc44f275c20b58f026e31f11d27a04e0b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and PDF_MALICIOUS_REDIRECTOR_LINK confirms a malicious destination. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which is likely used to funnel victims to further malicious content.

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=bedding+and+bed+sheet+set
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/72747027817.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6604/files/rupinavudavadibutafesez.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/kpss_coC49Frafya_soru_bankasC4B1.pdf
    • https://cdn.shopify.com/s/files/1/0440/2426/6917/files/aprilia_srv_850_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/29580241874.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/bijilogavuvip.pdf
    • https://static.usrfiles.com/ugd/0baf77_3ef4e87608b74d26b33111c765cdfc08.pdf
    • https://static.usrfiles.com/ugd/b8c837_d422ec1068354474a274f0a8a3d3554d.pdf
    • https://static.usrfiles.com/ugd/3b7182_9bff7281f59b400b8d89e4ca99316d07.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/1206884533.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/fluke_80i_110s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/17848617822.pdf
    • https://cdn.shopify.com/s/files/1/0454/9050/3832/files/probability_theory_and_examples_rick_durrett.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/6387988376.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_off000077a8.bin
6c9594e1821916cab5f03037fd05569d42bdd08742d37c0ce281166d23318c81
pdf-font-stream PDF embedded font (sfnt) at offset 0x77A8 5148 bytes
font_01_sfnt_off0000892c.bin
c4c49f9f310abcb67493e459ecd79c6402950c922016f58bfb335f516ad9c972
pdf-font-stream PDF embedded font (sfnt) at offset 0x892C 10772 bytes