Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b21568cda98dbe…

MALICIOUS

PDF

33.4 KB Created: 2020-08-07 08:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b71e23aed80e93e02df30d6534afa35 SHA-1: b026c89f49d65e94a32a200da8c15e1bad863801 SHA-256: 93b21568cda98dbea44f7aa081fbf87244a81ecc1eaaaf322bdb6d93b1857300
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious redirector URL being ttraff.cc. The document body, though heavily obfuscated, contains references to 'Ansys help manual pdf' and includes the malicious URL, suggesting a lure to disguise malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ansys+help+manual+pdf
    • http://bevuleson.fixmygaragedooripswich.com/uploads/1/3/1/4/131406717/3552404.pdf
    • http://files.athomeinthewoods.org/uploads/1/3/1/3/131379567/7ac357871a5f6f.pdf
    • http://files.dazzlingthreeboutique.com/uploads/1/3/0/8/130874276/silaso_mopitimuworelis.pdf
    • http://files.kentuckysocietyforrespiratorycare.org/uploads/1/3/2/6/132682861/91fdd3633b.pdf
    • https://cdn.shopify.com/s/files/1/0429/3751/6191/files/makkar_ielts_speaking_free_download_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/0067/3950/files/marmoset_toolbag_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/77404031682.pdf
    • https://cdn.shopify.com/s/files/1/0437/8319/2738/files/window_registry_editor_version_5._00.pdf
    • https://cdn.shopify.com/s/files/1/0430/5446/5175/files/9579851397.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/25802446036.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/madibirolom.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2038/files/ielts_writing_task_2_synonyms_for_adjectives.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/79862967582.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/walter_mitty_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/37680304196.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_off00004653.bin
3bb00959fa0e764524d7a1abac993ce1278cf8ef6b363242e7109c3bb67af696		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4653 5276 bytes
font_01_sfnt_off0000582b.bin
58263ea4b0a468693ca24e9f53aa025eecfe3093be1ec501950f673f26a8d245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582B 9600 bytes

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