Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abe743b0157cc5b…

MALICIOUS

PDF

47.6 KB Created: 2020-08-31 13:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cb2c367a4b6c287435fccc5baca31c9 SHA-1: 27d38aa3af19989e409b3eb89d8c8ef91f158895 SHA-256: 7abe743b0157cc5be4095ca68a1e88b9e92dc6d35b0bf186a09926e5d25930f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the text 'brooklinen sheet care' and the malicious URL, suggesting a phishing or scam attempt. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to distribute further 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=brooklinen+sheet+care
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/10e3af_5d171d1f25e8477d977958037dbd4cac.pdf
    • https://static.usrfiles.com/ugd/6c032c_69ee9bc88c0c4b378f711561f84d5249.pdf
    • https://static.usrfiles.com/ugd/d3758e_ae9ec1fb98ee45d6b0e9dd81338bd107.pdf
    • https://static.usrfiles.com/ugd/c8a981_738c5d8028ad4ec6bcb43e1c0d12db0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_03fb1bcaf6654da59505a5368b2e52fe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/am_i_insane.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/badri_songs_naa_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5384/files/makamenesaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/27067061331.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/52232430199.pdf
    • https://static.usrfiles.com/ugd/b8c837_53dc5c50d03d4dca8048a1457711c668.pdf
    • https://static.usrfiles.com/ugd/de02f3_debaa7fd6ddd4eaca77dfce114fc36b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_d08cb33ae5f14941bfc7375b4b153197.pdf
    • https://static.usrfiles.com/ugd/b8c837_574a705aa07d4f799105fe34f2ab17ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd134cce73ed48b3b14e5292415ba184.pdf
    • https://static.usrfiles.com/ugd/09c3c7_9f2eed16001c4891a422213be9377aed.pdf
    • https://static.usrfiles.com/ugd/cc14e4_ad5a7653715b4dc58346ede6017cf3d9.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_897b68e7a0164deea8e5922ea97051fa.pdf
    • https://static.usrfiles.com/ugd/93971e_18bbd8cb2dea4d29861eb67d5e2bacbb.pdf
    • https://static.usrfiles.com/ugd/726ec9_fd3f203ffc2b4e9facdf467f5083ca6a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bbd.bin
65297509fbcbe2514d59d56a50e1a220f3978f50fc3dd746778b28c0bcc7eae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBD 5000 bytes
font_01_sfnt_off00008cb9.bin
483f307b413795b7f35e7eba9ff022696951c5e1adc39a4bb57ada7acbe875d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB9 10816 bytes

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