Malicious PDF — malware analysis report

Static analysis result for SHA-256 536cc0186ab81f7e…

MALICIOUS

PDF

44.1 KB Created: 2020-08-18 23:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2807343f5cdd2b147d202ae93d94c0fa SHA-1: 738df2c4e67772e8ccabdf2e1e223175b1a9b49e SHA-256: 536cc0186ab81f7ec4b2b1672c95f2fae831491df63768dbf6e0a046a1738f5f
130 Risk Score

Malware Insights

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

The PDF contains a deceptive call-to-action and multiple embedded links, including one pointing to a known malicious redirector infrastructure. The document body, though corrupted, contains text related to 'change pdf file size online free' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to host further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=change+pdf+file+size+online+free
    • http://nifiwim.ledlightstrading.com/uploads/1/3/1/4/131453284/7556952.pdf
    • http://files.campwannacombac.com/uploads/1/3/2/3/132303238/fudivefamibed.pdf
    • http://nazenone.t-ris.com/uploads/1/3/0/7/130740069/8598353.pdf
    • https://cdn.shopify.com/s/files/1/0438/0760/4896/files/lajetuduruvutax.pdf
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/cathtrisme_urtral.pdf
    • https://cdn.shopify.com/s/files/1/0429/1297/2963/files/titipazenarupeboxef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67768868558.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/birthday_banner_template_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/76327955253.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/charging_pad_for_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061f1.bin
367bfe54a08010b502058ad0eeb25fc43c52c4fe3a516e0c81b6941f4bec0ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 5084 bytes
font_01_sfnt_off00007332.bin
3a405792ffa2b69d61eafe58fa45f820cb046bf8fa10a2cc9213d559556879e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7332 10180 bytes
font_02_sfnt_off00009601.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9601 4324 bytes

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