Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdac671a9456caa…

MALICIOUS

PDF

45.1 KB Created: 2020-08-29 21:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1521c27d94d795242cef5948302586ea SHA-1: 89490858a537e6b5768324c64f9aa2963c23b0af SHA-256: 4cdac671a9456caada4ef2fe850d375a06e9c71872b6bef877bf91ffe20f2f1a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The document appears to be a lure, using a fake song download title to entice users to click the embedded malicious URL. No scripts were extracted, and the PDF structure itself does not indicate further malicious activity beyond the redirection.

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/wix?keyword=hey+ram+hey+ram+full+song+mp3+downlo
    • https://static.usrfiles.com/ugd/b8c837_96711c4ee1d3412d9f57b6d255b93abe.pdf
    • https://static.usrfiles.com/ugd/7603ae_ff9ba6fbe62c41a985416eb45d114f2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7158018ce86b44ffa626a76abc9a9b06.pdf
    • https://static.usrfiles.com/ugd/b8c837_43cfc2a5113842e4b04da51788aeff86.pdf
    • https://static.usrfiles.com/ugd/b8c837_982450f31caa47e49c2610d71b46073b.pdf
    • https://static.usrfiles.com/ugd/934fc3_f501ecc6b6094e95b0e44f0b39e3a80a.pdf
    • https://static.usrfiles.com/ugd/269bb8_83208d4a85814998b14bc54d45fb8adc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9023c3dfb24611a4b12272a3f8156f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e93bba4aaf294c8580a8d5815231a183.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d67ec2f2de2477b96a9c3a4be8db334.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bd0d1aa19874c7d9cbbf58e5ae403fd.pdf
    • https://cdn.shopify.com/s/files/1/0436/0483/6515/files/mapa_turstico_bilbao.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/laregulilonobazumoxizu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059bc.bin
644c6716fd97edc8eefddb433bd9e58455bac9d4d874ee6a58a0b435e166a004
pdf-font-stream PDF embedded font (sfnt) at offset 0x59BC 5772 bytes
font_01_sfnt_off00006d53.bin
e210fdd300c6772dff468ef03a181e115224ab4e16100ecb25114e6835b3fe08
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D53 15072 bytes
font_02_sfnt_off00009cd9.bin
2db725c0db4bc1d7418fa7c7f2b841273cfde3ef3716592c7f1225d0735fc675
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD9 2688 bytes