Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6772e85a4100b8…

MALICIOUS

PDF

40.7 KB Created: 2020-09-08 02:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ade609ee236c88eae7a813b5f89a43 SHA-1: bfbc9c57499fb8db04e32cdd54d1f1fab13a3c24 SHA-256: cd6772e85a4100b868a026b3f1ad21ac8599434d6fdb9ae17bd56f5591a3cf53
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, many of which point to a domain identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for movie-related content, which is then redirected through the malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure.

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.club/pify?keyword=vimanam+movie+full+songs
    • https://static.usrfiles.com/ugd/affaa6_b9c2b76cc39d4406989def7df3b8b748.pdf
    • https://static.usrfiles.com/ugd/66f3f9_fe933dc0a65341bf8f8c8c2081c71adf.pdf
    • https://static.usrfiles.com/ugd/891219_2456a3b28c3c4f36a6b5fbe09e1272e2.pdf
    • https://static.usrfiles.com/ugd/585b1d_8110443433924d999eb883f45dce21d1.pdf
    • https://static.usrfiles.com/ugd/a58b01_a521ba72006a4e69a1e188f4532dc963.pdf
    • https://static.usrfiles.com/ugd/b8c837_9279de599f68444c995f795baf3c8916.pdf
    • https://static.usrfiles.com/ugd/7e6083_702fbe1cb4a54abd8b0cba33d61d1868.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/dictionary_for_brute_force_attack.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/asepsis_antisepsis.pdf
    • https://static.usrfiles.com/ugd/87b9a8_dd923230e0a84c829f2612002a4daeab.pdf
    • https://static.usrfiles.com/ugd/3402b1_fa31efc2babf4b369767c81fb7975a33.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb642f2e8f87472d92571b067a601cef.pdf
    • https://static.usrfiles.com/ugd/0d089b_f5ca566ab326418cbcc908eccccaa953.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061cd.bin
ba2423a6401ab8b21e9cf2dbdbd4894a7a9900e76c9ec570195a16cae70aa9e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 5016 bytes
font_01_sfnt_off000072da.bin
8bf31f862bac0a582dfd607c8394aac5270d81aeb9d3814dc08ecbe2cb84fdb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 10568 bytes