Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a720d02b638eff…

MALICIOUS

PDF

39.5 KB Created: 2020-08-18 13:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f91f86100ea1baccfc9597dd2e4021c7 SHA-1: 6a7fdb59329710613c1e1ae858ca6a38ae5ebb97 SHA-256: 92a720d02b638eff8924bca82adcb07c941a381c48cb7cace0833c80c07c92c3
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with a critical heuristic firing indicating a link farm pointing to a malicious redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=yazoo+county+arrest+report. The document body itself is largely obfuscated but contains this URL, suggesting the document's purpose is to lure users into clicking malicious links. No scripts were extracted from this sample.

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/pify?keyword=yazoo+county+arrest+report
    • http://files.pensedesign.com/uploads/1/3/0/7/130776208/jeziruguwikux.pdf
    • http://tepulibux.ejhayesorchestra.org/uploads/1/3/0/7/130775085/af610708.pdf
    • http://files.thesekidshavetalent.com/uploads/1/3/1/3/131379875/ba8e8fba62b41c0.pdf
    • http://wukupi.ilovethebeach.info/uploads/1/3/1/4/131453950/5679467.pdf
    • http://files.tricitiesfire.com/uploads/1/3/0/7/130776487/3073341.pdf
    • https://cdn.shopify.com/s/files/1/0429/3761/4499/files/alstonia_boonei.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/kipuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/ximodamagumulomixogaxukor.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1237/files/44619463759.pdf
    • https://cdn.shopify.com/s/files/1/0440/6450/6006/files/become_a_youtuber.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/52511221874.pdf
    • https://cdn.shopify.com/s/files/1/0439/5725/6350/files/bivogulezuratesuzazewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4678/8502/files/95455835084.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/65116056402.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_off00005c7d.bin
68171acbcd3a173641ba07c8e6424167d3f5d5e5bb08a1e568549476e7369cc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7D 5008 bytes
font_01_sfnt_off00006da8.bin
f2df672e1253ecca98f72f9a7177d49930cf4651ef85a5af95f8e3c0568d8c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA8 10404 bytes