Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b58bdcbd44b535a…

MALICIOUS

PDF

50.1 KB Created: 2020-09-10 00:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e901bffe47128de2f4ac2f3b20325bb2 SHA-1: 307bd05a79f8adebe59683adbb81296a954178f2 SHA-256: 7b58bdcbd44b535a37d647d2fbdc524735d358c3433e78c8469d92109abcc2c3
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, many of which point to external PDF files hosted on Shopify. The primary link directs users to a redirector service, indicating a malicious intent to lead users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=cantarell+regular+font+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/bozolatonijurobeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/57839102835.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54344474436.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/ghtroc_720_light_freighter.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/tecnologia_con_enfasis_en_informatica.pdf
    • https://static.usrfiles.com/ugd/a382ee_dae4be92c29048d699deb7f0072869ce.pdf
    • https://static.usrfiles.com/ugd/804ff6_cf1dc74de97b485ca6e2af32a650b64d.pdf
    • https://static.usrfiles.com/ugd/756799_cd9c82dadc9d49be9efb90fb83fd3e6d.pdf
    • https://static.usrfiles.com/ugd/60ffa2_a74a772f12b64ac08083165a86155ef7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9a201ea9e9b486cbd7d8926f9c12019.pdf
    • https://static.usrfiles.com/ugd/22bf55_3c84480fd6514b0caf399d9f2f3fd8ed.pdf
    • https://static.usrfiles.com/ugd/d5415a_10820d132695440e9361969e8f2955aa.pdf
    • https://static.usrfiles.com/ugd/37321e_bae00089f12f4d03b07ea7df85b2d4fe.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_276cb730e6624d5bbc435a875d63a6e0.pdf
    • https://cdn.shopify.com/s/files/1/0439/4981/8024/files/active_and_passive_voice.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6438/files/bopuwazufodatoxexenuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/6708/8800/files/46660693886.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000589e.bin
36184bcd743a3ea9e136458078ba4a1934560c894f6298905957054721125f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589E 4664 bytes
font_01_sfnt_off0000688a.bin
029ada6c0352002c1b2eb85b0db7687f41e60632ba246e38a5818f025310aa35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688A 22648 bytes
font_02_sfnt_off0000a55e.bin
f1459cdf1e1335aaf12d9b48a7ad011a242bde279d98f734cd350a619160e923		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA55E 16276 bytes

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