Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b8bc78c0e9f476…

MALICIOUS

PDF

76.5 KB Created: 2020-07-30 22:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b3d7b918b5e2919f11fc53aaf960d41 SHA-1: 1908d85df2cbbc9d8180815112ba6cc0a36c6923 SHA-256: 01b8bc78c0e9f4763f5d6692a3c758c039ee2f336c0c79cb23b829443e3936d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, identified as a link farm, with the primary URL redirecting to a malicious domain. The ML classifier strongly indicated maliciousness, and the embedded links are designed to lead users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the attack.

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=brecht+das+leben+des+galilei+pdf
    • http://files.sarahkramerharrison.net/uploads/1/3/0/8/130874368/5274079.pdf
    • http://files.reelectjudgetabbey.com/uploads/1/3/2/7/132712545/xijube.pdf
    • http://files.nicreconciling.org/uploads/1/3/1/4/131408930/visexejike_wusuwatuvef_wodux_jalonemoje.pdf
    • http://files.apprazrapp.com/uploads/1/3/0/7/130740465/5f232ffc810.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/muzubudatimog.pdf
    • https://cdn.shopify.com/s/files/1/0435/1629/7368/files/69527957035.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5664/files/34110683498.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/30575224377.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/gulidikogazedabazetirilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/zuxotanutetadis.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/xiwuruz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/68843905453.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6256/files/wejawazukavuxutexutenalir.pdf
    • https://cdn.shopify.com/s/files/1/0429/0904/0803/files/najaboj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf2.bin
c7684e4d4c57e2a3343a7d6f4ffbee447d4b2b0cd49a8533b4d843d2d26876db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 5284 bytes
font_01_sfnt_off0000fdd7.bin
0f7c2a6c0c7939d46056082eb4e667b86c233f791eb2979c8ce6e0a6ac40491a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 11392 bytes

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