Malicious PDF — malware analysis report

Static analysis result for SHA-256 006a99d483f2440a…

MALICIOUS

PDF

37.0 KB Created: 2020-08-30 17:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98a92c35d50ed100e4882c217ee68709 SHA-1: df6097d999a1fb76d347ccdf88f2163d5d755e5e SHA-256: 006a99d483f2440ac6257abdcd2afb2f31e5823a7ee32717f74f8fa76b6988bf
154 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm pattern, embedding numerous external links, one of which is a known malicious redirector. The document body contains garbled text but does include the malicious URL and several benign-looking Shopify URLs.

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.cc/wix?keyword=modal+verbs+advanced+worksheet+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/2806/5949/files/baldor_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1373/files/management_of_acute_pancreatitis_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/gtx_970_benchmark.pdf
    • https://cdn.shopify.com/s/files/1/0462/5206/4917/files/hospital_bed_sheets_twin.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/english_tagalog_translator_offline_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/63517780522.pdf
    • https://cdn.shopify.com/s/files/1/0445/3846/2372/files/coffee_break_spanish_guides_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/formation_of_continents_and_oceans.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0c8a07c63bc4490848aecc2d8d2a1b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4815c83b5ea43cca81076e6b930a981.pdf
    • https://static.usrfiles.com/ugd/b8c837_1868644f22254e8fa3d860ac5f3c841c.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_off00005236.bin
2675e83a3ca7a11b4ab4ca39583776d3ba4d7ac0c587bcf89e4208359cbb10b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5236 5604 bytes
font_01_sfnt_off0000655d.bin
afff45ffa84958f9a54a2f52cae9a10e4cf62471daf448fd94deeb02c70c40a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x655D 9992 bytes