Malicious PDF — malware analysis report

Static analysis result for SHA-256 11114a7ffb95e1e4…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 01:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ad40c2e092dfb1c22ac877617291b06 SHA-1: 390605b656f78bd617ac780a3e02ef2858842b30 SHA-256: 11114a7ffb95e1e4d4c33d7af904cc4d9e84ce5f6218e40b2a70527a46e3f457
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a redirector and a large number of other PDF files, indicating a link farm strategy. The ML classifier and critical heuristics confirm the malicious nature of the PDF, likely used for SEO poisoning or to distribute further malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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.ru/wix?keyword=honkie+bowling+tournament
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/ab922d_776295c53b1a4827ac4685ce4e94268c.pdf
    • https://static.usrfiles.com/ugd/b8c837_356757b73cb642b19deb0bff8ac64bd6.pdf
    • https://static.usrfiles.com/ugd/b5aed9_b4185f88b79b4e1185b0474c24753c88.pdf
    • https://static.usrfiles.com/ugd/2ac701_94385891c6034738a650ba3e5cb946cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_96b2e90230c841c2ac1b7b735ba3c03a.pdf
    • https://static.usrfiles.com/ugd/e73fea_8da3538e6a4249b788c2e3c78ae38e71.pdf
    • https://static.usrfiles.com/ugd/93c935_b85ae37367154c638e97efb463dcf84c.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8501/files/zezokoma.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/82896276905.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7263/files/27653400794.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/bahishti_zewar_book.pdf
    • https://static.usrfiles.com/ugd/856cea_749cec79ca6b4e3f811bf0ced7333e66.pdf
    • https://static.usrfiles.com/ugd/b8c837_92285239dda64af3bd69be43a5aa0015.pdf
    • https://static.usrfiles.com/ugd/cc03df_b75d9c998ebb4514a10cb53136fd3fea.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061aa.bin
46d2b067175ffd4f41558b62a97bb8f8d69a64b0f0162a267261adf339a1ca5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 4964 bytes
font_01_sfnt_off00007286.bin
7e96c4f10282edf3375ed6d3e1a0c18a99656dd868ed9ef267c667d3b042d906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7286 10208 bytes
font_02_sfnt_off00009594.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9594 4324 bytes
font_03_sfnt_off0000a396.bin
ffc9223e6ce5215c90c81ae2c0bef1a8da0e1d12290d1d5a77d0b698d2a424d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA396 2996 bytes

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