Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e336663f86f06a1…

MALICIOUS

PDF

53.8 KB Created: 2020-08-29 23:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc0bf73dd58564c14e516c54a7a062f9 SHA-1: ffd8ac2b1225188fb99a01aaa7bde4d9f1940ac1 SHA-256: 0e336663f86f06a129e778102056d2fbd875c3e721b2bd9eb03b38e26e1ab329
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to a harmful site. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic points to a phishing or redirection attack.

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.ru/wix?keyword=minecraft+by+zyczu+1.12.2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ea5d7b_50b9b74d26fb462489d1c43f5b677d65.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c6863ba88144bb3a23b51bf74ff5727.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e92f99d0184713afe8be59e0e5d453.pdf
    • https://static.usrfiles.com/ugd/b8c837_67939c9c2acd465c9f9410e3c6801e63.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2102/files/75271809493.pdf
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/icm_business_management_and_administration_notes.pdf
    • https://cdn.shopify.com/s/files/1/0447/9103/8118/files/bewufekopijipukudez.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/riwor.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/kusemexerega.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/labrinth_jealous_piano_sheet_music.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6174b4b10694f6aaf6d5218462505bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7a807859dc34f56aad9b7afb7e94efb.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc4811e10edb45acbd096aa9428404c1.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_off0000946b.bin
df9c086c3344d0cd16e0e53e677b33891e46968085217f38b5d6911f3d436a27
pdf-font-stream PDF embedded font (sfnt) at offset 0x946B 5180 bytes
font_01_sfnt_off0000a637.bin
f51186d7730949e7c30893f54ad6b4b9b1936c120cf2d606a6b7894419803b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA637 10668 bytes