Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a88dce90fbf6d35…

MALICIOUS

PDF

52.8 KB Created: 2020-08-30 13:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fda4f918fe2d230de34eb279c82b4e5 SHA-1: a015f9f1a8ac84b38f70d7cce0e5819f2e43c584 SHA-256: 5a88dce90fbf6d35c6c3b9b2ce2700c76b2064bb763199c5fa4fc2e762353115
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, with the primary URL redirecting to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body text and embedded links suggest a lure to external resources, likely for further exploitation or phishing.

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/wix?keyword=analisis+de+componentes+principales+en+r
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7137/3466/files/simplicity_sewing_machine.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7253/files/a4_booklet_template_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0435/1724/7640/files/4288420957.pdf
    • https://static.usrfiles.com/ugd/0511f5_e04b19d182584388873a75e231be8e0e.pdf
    • https://static.usrfiles.com/ugd/93c935_c79ba530a23740a696dbc16fcd8483df.pdf
    • https://static.usrfiles.com/ugd/ade4e6_6e708500aaf54d85a1e6336ef6d4bdec.pdf
    • https://static.usrfiles.com/ugd/b8c837_442329143f1244b99b68507da90d1fdc.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/powerpoint_games_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5190/files/womofek.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/dont_trust_the_bitch_in_apartment_23.pdf
    • https://cdn.shopify.com/s/files/1/0429/5553/8595/files/nopodumixodinawagokaboxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6223/0181/files/dfinition_de_la_gestion_de_la_relation_client.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007731.bin
179fd7fef7426eacce7949d1c88c66ee39b51f01e2a5c76ad9a41ca9101690f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7731 4996 bytes
font_01_sfnt_off00008801.bin
78fd39c7d69d3893a4ba9b4bad18dbb5d0974dc3ba6465290b4baec9ed2a26c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8801 15392 bytes
font_02_sfnt_off0000b7e8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 4324 bytes