Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedbbfa8d91f1684…

MALICIOUS

PDF

42.6 KB Created: 2020-09-03 03:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33b4fc91f17586b4b1e371958437f419 SHA-1: 8e2bb24621c48ffa1fbc3136a3729b7d02946802 SHA-256: aedbbfa8d91f16848f452992e30bacdf1520b7a1d82a34df56fcdde408f5bee4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link disguised as a search result for "Mariah Carey hero piano sheet music". This link, however, redirects to a malicious URL (https://ttraff.me/wix?keyword=mariah+carey+hero+piano+sheet+music), indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector link further supports this assessment. No scripts were extracted, and the document body was heavily obfuscated, but the primary attack vector is the malicious link.

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=mariah+carey+hero+piano+sheet+music
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/27566778378.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0433/5933/8661/files/82038849725.pdf
    • https://static.usrfiles.com/ugd/bd1fc0_39e38335cdad4bd986fed7f22a50a9fd.pdf
    • https://static.usrfiles.com/ugd/24853a_6999b85493a847d4b66a54eaeaa0a4c0.pdf
    • https://static.usrfiles.com/ugd/eb4c03_64d10abe230643148680b257aa4dd4de.pdf
    • https://static.usrfiles.com/ugd/78c764_14b86a046e7941f3b5f8dfbe74044849.pdf
    • https://static.usrfiles.com/ugd/0e2875_219bdeb2c10e4a0dbd4d0db89ed88a56.pdf
    • https://static.usrfiles.com/ugd/71fd01_82b241dace2346cc936e11a36cde3dda.pdf
    • https://static.usrfiles.com/ugd/98e298_79d7392128b5465595be2e00eb0dd663.pdf
    • https://static.usrfiles.com/ugd/eaf48f_ac1f5cf6f82d48d198f7c71eec0465ea.pdf
    • https://static.usrfiles.com/ugd/ef7486_bc783e2bc2c3481e95b80581529435d8.pdf
    • https://static.usrfiles.com/ugd/b0cb2d_7eee256d3ea94305a71cf99d42c6c351.pdf
    • https://static.usrfiles.com/ugd/b8c837_44efff5c5cb9483fa3f7557a02b30d8d.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_off00005c32.bin
c0b6255a045a0d8bee28cd6b409dfec64bdbc3a37e1432e16347eb0d9fc21b9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 5248 bytes
font_01_sfnt_off00006df4.bin
616d3183e2ca6b547a863c90c2755e4dec243522309a58aa2b6e7882157f49a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF4 14820 bytes