Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9b982c31d0d732…

MALICIOUS

PDF

45.0 KB Created: 2020-09-02 02:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53dc8476ae05b6a2dc15e45fad6c4af8 SHA-1: c7a0d9f045d68746939d3bde0a90ba0c02c28d53 SHA-256: 5e9b982c31d0d732f09f7e0698991b9593570778eab5107dda36476133acbf17
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one critical link identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Windows 10 64 bit for pc' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. 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.me/wix?keyword=windows+10+64+bit+for+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_9cc8506eb33d413a80025dac45783ca4.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_564c34229add489081bda04b106b009d.pdf
    • https://static.usrfiles.com/ugd/a2e20a_4e8e589fb77440eaaa5ab70c20a0144f.pdf
    • https://static.usrfiles.com/ugd/d1d005_39495d3878a8451f96a7a8d8d5c2ea30.pdf
    • https://static.usrfiles.com/ugd/ac72e0_07870d9f16aa43c68cc1efbb93ade004.pdf
    • https://static.usrfiles.com/ugd/ae15ca_5662788a0e354bd7825143bd3c55e34c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbc05465ae0a4ac48cead0826860b0c9.pdf
    • https://static.usrfiles.com/ugd/99965f_6fd6b2834cff4ab69ce4d2272eae6b47.pdf
    • https://static.usrfiles.com/ugd/b8c837_12b032929c1c4d90a34db89513d70f04.pdf
    • https://cdn.shopify.com/s/files/1/0432/7840/1700/files/bryant_evolution_thermostat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6131/2676/files/35410391636.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_off00006427.bin
b00eae68261525c71f30ed83d5230d2ccf22dd5829b324182c4cc6a007ba91fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6427 5256 bytes
font_01_sfnt_off00007627.bin
bfe450d868d0e6f6b39b4e02f5be9a0fc5c822a91e5bf1215331ba03f48430e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7627 10316 bytes
font_02_sfnt_off00009984.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9984 4324 bytes