Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc6c86caffd356d…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 06:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e60cc86826aec1809b6e092ffe140c SHA-1: 0c038968f56a5698f9792fa30cf813b4b067696b SHA-256: 3bc6c86caffd356dde6b4c5124138e722024ad8eea0e286c05941d52fde59d3c
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a 'PDF SEO Link Farm'. One of the primary links points to a known malicious redirector. The document body itself is heavily obfuscated and contains a mix of text and URLs, including the malicious redirector URL and a link to a PDF hosted on Shopify. This suggests a campaign focused on driving traffic to malicious sites or distributing further malware through a link farm.

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.com/wix?keyword=m+aesthetics+of+orange+county
    • https://cdn.shopify.com/s/files/1/0429/2437/6227/files/audio_cutter_app_9apps.pdf
    • https://cdn.shopify.com/s/files/1/0437/0530/3190/files/fazetidifanijixipex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/green_building_design_concept.pdf
    • https://static.usrfiles.com/ugd/b8c837_2144100e9be34a09ba9a82ea531e3fca.pdf
    • https://static.usrfiles.com/ugd/89c6ad_bc5b66eea451477580fa3cd75e221f7f.pdf
    • https://static.usrfiles.com/ugd/b444d4_409b7d11f1034d568380592495d1348a.pdf
    • https://static.usrfiles.com/ugd/2b25e8_b750c558dc5d46dd87645237f276de4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a81ace8223e44e36bc80f160beee2555.pdf
    • https://cdn.shopify.com/s/files/1/0435/7160/9761/files/killing_floor_incursion_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/61077501741.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/carrier_psychrometric_chart_si_units.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/cisco_webex_support_center_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/58684084639.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/26043482137.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/rudepalijawuri.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_off0000549b.bin
eee9f36e324c71fb6d43644a5dd5f9752b310db7150b322f5243f74fcdfb9b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549B 5220 bytes
font_01_sfnt_off00006661.bin
f958ebb162e10205b8d04197fddda698ebeb8949677baad812652d4cca108e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6661 10600 bytes
font_02_sfnt_off00008acc.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACC 16036 bytes

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