Malicious PDF — malware analysis report

Static analysis result for SHA-256 933febc6b4dfcb30…

MALICIOUS

PDF

46.5 KB Created: 2020-08-30 16:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fcf5363ab334efc76e47848cf06181f SHA-1: 2f0adbdc535bc9617e0fbcc9aa14ad90912fc02b SHA-256: 933febc6b4dfcb302f6f72849b5ecb637de58d041ef3d5f85f4ed31f31dea0f2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to distribute links. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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.com/wix?keyword=five+ten+guide+tennie+approach+shoes
    • https://static.usrfiles.com/ugd/227d0f_5e45c27708054e64bf134ee2ac6bc726.pdf
    • https://static.usrfiles.com/ugd/b8c837_d31096489efc48f1ae5892255feb8075.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_ffbd256fa37141b5bd4effa13682c776.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/rufegasir.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/91636208835.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/nafex.pdf
    • https://static.usrfiles.com/ugd/b8c837_f872e80152084739b4d1b42d023644cb.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_b0e443cd484d47f69c7fe80979ff43b6.pdf
    • https://static.usrfiles.com/ugd/0aab01_a8db47553a864bf5b195a5dde345c4cc.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_e8f372f4c6214947906e6ae6e94179c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_74a7e9162a694b34bc0a06287e79a99f.pdf
    • https://cdn.shopify.com/s/files/1/0435/4975/3507/files/xosibevapuxejel.pdf
    • https://cdn.shopify.com/s/files/1/0429/3545/1804/files/66991928615.pdf
    • https://cdn.shopify.com/s/files/1/0432/5199/0691/files/pofibuvajemogilaludif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8685957786.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/38839532990.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a24.bin
fd954c12232dded6e73a76395a8fe3e9c55b2e13dfdc553e66fd0e454f168866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A24 5200 bytes
font_01_sfnt_off00007bd1.bin
6bf660aceb0d778d7b79b40ace12dbd64af012bae31dafca8e4164a166ae6416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD1 10084 bytes
font_02_sfnt_off00009e55.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E55 4324 bytes

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