Malicious PDF — malware analysis report

Static analysis result for SHA-256 054c33b02901133f…

MALICIOUS

PDF

55.5 KB Created: 2020-10-30 06:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 0be941e5d9b112c155446cc76756bf1c SHA-1: ba3ea29ae20e4df7d568fcea42c11886fe0ebcdb SHA-256: 054c33b02901133fd2674443a7916abffe2142c04ed01a0805e80378371a72af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is a strong indicator of malicious intent. The document also features a large number of external links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The ML classifier also strongly flagged this PDF as malicious.

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.link/123?keyword=and+but+or+worksheet+pdf+for+grade+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f8a11bc00ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f870c99527af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_5f939f66ad765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71466027-224f-43f8-a078-51b071cedc65/c_programming_balaguruswamy_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e33b3b-71dc-4317-ab13-f57225cb0876/20734890331.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1544/4903/files/59244212333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd0cb1c-fb98-48c2-bd5e-3878e19aa923/wisoxazepirujinawijino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3919/3799/files/famifulolivewelesizazata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8950/9017/files/lonujawerulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb62413b-7384-42b5-9226-231bd4b47637/46665914025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9618/6274/files/double_column_cash_book_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837102f7-4fc0-4747-8acc-d0d6dd8b0dc0/alum_creek_state_park_campground_site_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/lajun.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000735e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 5688 bytes
SHA-256: 9553bf37d40afdebfeef010d4b19edd673d6569d909229f68b7ae4b49dfdd163
font_01_sfnt_off000086c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C1 10476 bytes
SHA-256: 98890c0de34948a5d5a0eebb0c3bf53dda40cfbc8129424c56653a3c6b16b54f
font_02_sfnt_off0000aaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA1 22880 bytes
SHA-256: 372cdfa26f38f9642743fdbc13b74afbec2a9258bd6b18ff19ed5f7136ce356d

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