Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f880603de181b7…

MALICIOUS

PDF

60.4 KB Created: 2020-08-10 06:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280c1b7907d13ad4e97f8fa244753502 SHA-1: 85f90f84a235bb1e11616c4d91470acac0509e3e SHA-256: 10f880603de181b77859cbc476b50db2243b5b7bee0cde7b4bed3e51924858c8
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though garbled, contains a URL that matches the malicious redirector found in the heuristics, suggesting the document's primary purpose is to lure users to 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.cc/pify?keyword=mathematical+logic+a+course+with+exercises+pdf
    • http://files.josephinethomason.com/uploads/1/3/2/3/132302928/nivusikigikokede.pdf
    • http://files.triyogadueren.com/uploads/1/3/0/7/130775156/molakive_lifiwe.pdf
    • http://files.christinetracy.com/uploads/1/3/1/4/131408502/8284616.pdf
    • http://files.alittlebitoftheworld.com/uploads/1/3/1/4/131438604/mukezi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/1754439983.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/kazumunalovexug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sividejujim.pdf
    • https://cdn.shopify.com/s/files/1/0452/9104/5026/files/ganojewipimidag.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/610228142.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/mudexix.pdf
    • https://cdn.shopify.com/s/files/1/0448/3658/5629/files/arabic_letters_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/xesomolowaduk.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/ohio_state_football_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/45185343657.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/gigusudiju.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_off0000a1c1.bin
dd80c9b4cd7da1dc7c2fa018ef29a9030d6a9e30ec13ffd2ec2988bc7e4728e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C1 5508 bytes
font_01_sfnt_off0000b49f.bin
b8d00af8bb5198fd99ecf931bef65fed849b0c714b747c7e732b5c747943d0b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 9812 bytes
font_02_sfnt_off0000d62d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 4324 bytes

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