Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b9128ded70a0d7…

MALICIOUS

PDF

48.4 KB Created: 2020-08-30 23:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 232f1ae3eb0c904500bc7c6d50359764 SHA-1: 7900862b78bdaa9afafb08d32fbee8bf84db4f5a SHA-256: 71b9128ded70a0d7c08defdc17e0dfa28700cf9e45d91f4957dec152be3183cc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO poisoning or link farm abuse. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=carbalite+ore+mhgu'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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=carbalite+ore+mhgu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/76050811631.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8090/files/text_message_backup_android_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0434/8480/7334/files/amplifier_repair_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f19fccfaa3946ce9e5e591fb39577f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa3f79f315344e1b9542d8b04c15f966.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_0901f0e472e94248a7623987149cda23.pdf
    • https://static.usrfiles.com/ugd/79e5df_077a2b48317f451fa11487c934c6be9e.pdf
    • https://static.usrfiles.com/ugd/fe83c3_92b6996534f34d2f808ab78fae2169f0.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/pagop.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/energy_australia_price_fact_sheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_31d6aa0e9d5543118ae26bcf2e4f5273.pdf
    • https://static.usrfiles.com/ugd/b8c837_18454bd4b1a940c69a2745f16d8d8ce5.pdf
    • https://static.usrfiles.com/ugd/d01287_4ab124a621184315b57fe8d306df8d74.pdf
    • https://static.usrfiles.com/ugd/b8c837_616489f646b44c4f97f250f1b4d87860.pdf
    • https://static.usrfiles.com/ugd/2ca09c_359e5c7143f64f6f9360b227e801ebb3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bc0.bin
d3eb911dee34bb85970dfd5215a3e3971891bb114ea2a665f7ffd54e43dcc98b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC0 11044 bytes
font_01_sfnt_off00008036.bin
9e2214e17737260a89192af820fd2b4398510c4385b1220ab3156215210616e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8036 4968 bytes
font_02_sfnt_off000090f5.bin
09465814a30d5fb8d2b658cad7d2f548c615d3a1ac1887c4635e6e42847a6a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F5 10352 bytes

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