Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89c043b2183ce2f…

MALICIOUS

PDF

45.7 KB Created: 2020-09-09 04:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c6832a608abca8f4819fe89cbd9abad SHA-1: bf11db1cad894796aefd1fb2b2b70676bd7c0268 SHA-256: d89c043b2183ce2fcf6f9ad12ac92f60c0367d1a86117d51e0046e1bb3fe9e80
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on Shopify and static.usrfiles.com. This suggests a link farm or SEO manipulation tactic to distribute 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.me/wix?keyword=entrepreneurship+development+book+by+senthil+pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/79304228022.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4206/files/mivexesefuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/vopafubivuludolerefuwifig.pdf
    • https://static.usrfiles.com/ugd/12daa7_acafc0ee8fef4d7599e884c4b2c1207d.pdf
    • https://static.usrfiles.com/ugd/c3f59f_5303a27d120d4511ac4ea42bcaf2fb31.pdf
    • https://static.usrfiles.com/ugd/2b25e8_109f1f598547491cb790db37698d7d2f.pdf
    • https://cdn.shopify.com/s/files/1/0441/3105/7816/files/sinoxuwomasug.pdf
    • https://cdn.shopify.com/s/files/1/0435/4598/5192/files/97702979844.pdf
    • https://static.usrfiles.com/ugd/e948c1_06428220960f4822adfcd2785ac5f8a1.pdf
    • https://static.usrfiles.com/ugd/575fb0_dfead2a0ee6f442494e3fad1fbce5e74.pdf
    • https://static.usrfiles.com/ugd/90423f_2c38f9c4363441b685547a2466a2ff7e.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005502.bin
dae48c16f5c94e7701268df6325fb17ff07c6e284140e5138365fb27b76d9551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5502 5396 bytes
font_01_sfnt_off0000673a.bin
2a9f38e4013f6806e6c7b650fcc870745972022bcdd15a68dd5daab70228bd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673A 2092 bytes
font_02_sfnt_off00007039.bin
89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7039 2116 bytes
font_03_sfnt_off00007a05.bin
a33d67efa9e92f2ea778bc6632a870050c2c08ad630dcb85b3d6414bf7688c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A05 15260 bytes

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