Malicious PDF — malware analysis report

Static analysis result for SHA-256 8493d56f8ac0872f…

MALICIOUS

PDF

56.4 KB Created: 2020-08-29 15:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64afba56ef3798d2af12886008ea1dd SHA-1: 364c273fd704d10665d9ae0d8976e46661bb0317 SHA-256: 8493d56f8ac0872f3530f1fcc10716f967bd83b97c76a910a6eb944c649c1507
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, includes a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site.

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=what+are+the+main+features+of+metaphysical+poetry+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9114/8454/files/jadutexilarivarese.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9714/files/45063536496.pdf
    • https://cdn.shopify.com/s/files/1/0440/1178/2309/files/sovasuxojutepetam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5891/3689/files/53732234577.pdf
    • https://cdn.shopify.com/s/files/1/0438/4129/0402/files/wobiwajifipej.pdf
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/95845081046.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/subukanazuwaduvebatib.pdf
    • https://cdn.shopify.com/s/files/1/0439/6895/4526/files/6639487750.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/capoeira_roots_of_the_dance_fight_game.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0023/files/78870021026.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/30213475105.pdf
    • https://cdn.shopify.com/s/files/1/0439/8612/4958/files/anthony_giddens_sociology_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/65070594714.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/bottom_sheet_dialog_android_library.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_off00009f42.bin
dab5e30c826c1d8a169595b1b591a67c67192b40c089ddb647fd96335c94e6b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F42 5508 bytes
font_01_sfnt_off0000b1f1.bin
75961656a8a1f9c4df4ae3f84abfca664b49ad24367086ca59a317104b6fd439
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 9960 bytes