Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c1f99154871d9a…

MALICIOUS

PDF

36.3 KB Created: 2020-08-30 02:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f95096465b81776d3f17a8a295bff115 SHA-1: 75b14d097c0338a0625021f06d61b62d78408d00 SHA-256: d3c1f99154871d9a5765baccea1c3435bc265304ff6fef95ab7f0d698424f081
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, https://ttraff.com/wix?keyword=hurricane+band+of+heathens+piano+sheet+music, points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs, suggesting a link farm designed to lure users to malicious sites.

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.com/wix?keyword=hurricane+band+of+heathens+piano+sheet+music
    • https://static.usrfiles.com/ugd/b8c837_778064ffdee04353abbbbfaab9dbc789.pdf
    • https://static.usrfiles.com/ugd/912de2_3192486b08d94cb7ac7168a5f451c2f5.pdf
    • https://static.usrfiles.com/ugd/6908d7_c388fae0cfde4e6986c13c0900113477.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa1d48ee2241479585c769cc68060bd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3628b14fd6614a71ad1472d7c8846ff4.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/2439005702.pdf
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/construction_project_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/juwosekamufezakirogirako.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9399/files/xuzofaravumazafowida.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_7327fdb077f34660bc98bd024ba91ff0.pdf
    • https://static.usrfiles.com/ugd/6cfc61_cf18d61dc3e74f72a462e00672f0dcaa.pdf
    • https://static.usrfiles.com/ugd/868401_98ad1bcb203445069584a214d63e5989.pdf
    • https://static.usrfiles.com/ugd/73c254_a7b79e38f0a04333a62c49a8089e466f.pdf
    • https://static.usrfiles.com/ugd/0d002d_12b219dd5c8e4d3fa2237ce41aafd32e.pdf
    • https://static.usrfiles.com/ugd/bd5c68_dbf485bd097b4adb89a9a1314c666ea7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7184b7482ff94b1cba247a814fe5e7b5.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_off00004fbd.bin
4e5effe01d8a96bbba4ad890bfc193a9e026b14546055fef1dc30b28785aac04
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBD 5464 bytes
font_01_sfnt_off00006219.bin
f818fa2c11986abb88bb078c0c9c28d5a481e76c050455c51a50e2a7a57e4038
pdf-font-stream PDF embedded font (sfnt) at offset 0x6219 9968 bytes