Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc625c7be0f495a…

MALICIOUS

PDF

46.1 KB Created: 2020-09-01 22:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 310854294115d5db1589ec3aa86db789 SHA-1: 7661bdf6b63dc623759af35896f4082a97156d6b SHA-256: 8fc625c7be0f495af067bf0d258dc1eab5460f1e72668e76d206702e859721ac
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=adoptive+leave+form, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'adoptive leave form' and the malicious URL, suggesting a social engineering lure. The presence of numerous other links to static.usrfiles.com, while individually benign, contributes to a link farm pattern, potentially for SEO manipulation or to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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=adoptive+leave+form
    • https://static.usrfiles.com/ugd/fedf23_b61df5dcb4674dee801a648ff185a2cd.pdf
    • https://static.usrfiles.com/ugd/8b9728_92ca386f0889412c98e89ff9a3ffb538.pdf
    • https://static.usrfiles.com/ugd/003b86_750cabae688846d89e47a5a7e3b448a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cb0c7f7e05c460f8636592472dbac9e.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_b54fa452422043a7b5b59bc7504d8929.pdf
    • https://static.usrfiles.com/ugd/9cc572_e4f17592cc6f4a6d99b4ea346d8fb52b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd8c060f0054c4aaf48efed9692b423.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2a7b9e453ab42369fa6184c26b403f4.pdf
    • https://static.usrfiles.com/ugd/b47706_4b92822f5e7d4c2ba8cc20a403ab8427.pdf
    • https://static.usrfiles.com/ugd/df4650_d3c1be3b082147649a24eb9abecdf568.pdf
    • https://static.usrfiles.com/ugd/f6a907_1ef931be03404d3e898e57eca7eebe0b.pdf
    • https://static.usrfiles.com/ugd/ec0c41_71a69d54337f4ccbafac3b86392d21eb.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/hp_2009m_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0920/files/68049762332.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_off000069d1.bin
0022c2adcfd8c161f6219ea6f69d59b53c1d020c0b291b0d3e465a4c82f92b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D1 4740 bytes
font_01_sfnt_off000079f7.bin
3bf8f512f24d5654428d42c47221a4af9b4dc64a43d4a22dc5395c8b27af92c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F7 10440 bytes
font_02_sfnt_off00009da2.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA2 4324 bytes

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