Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b15c7eb4b65f8b…

MALICIOUS

PDF

51.1 KB Created: 2020-08-14 22:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba765f6bdcf7d4d84802c098014f6ca0 SHA-1: 41e635d5350cfd24dd48c631e483d4640436defb SHA-256: 95b15c7eb4b65f8b1173d95eefe9409aeb4197981f3b44197ee7be62ae3c511a
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector. The primary purpose appears to be to lure users to malicious sites via a link farm.

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.com/wb?keyword=hindu%20boy%20names%20starting%20with%20k%20pdf
    • http://files.jeffersonpc.org/uploads/1/3/1/4/131437513/betodijopatemi_kibeseb_nerivomibar_peroxemazow.pdf
    • http://files.cornerstoneuk.org/uploads/1/3/2/6/132681516/7382336.pdf
    • http://files.innerlight-center.com/uploads/1/3/1/4/131407692/1bd3b8d2.pdf
    • http://files.esquimalttaxi.com/uploads/1/3/1/3/131379860/7047954.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/bebomonuwobaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/mabudibibis.pdf
    • https://cdn.shopify.com/s/files/1/0438/6534/2117/files/comparative_short_and_long_adjectives_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/2720/2205/files/63_chevy_pick_up.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/development_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/30550617366.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/41523035617.pdf
    • https://cdn.shopify.com/s/files/1/0430/3706/5370/files/stony_brook_university_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/7365026390.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/tipapimipufudan.pdf
    • https://cdn.shopify.com/s/files/1/0429/1805/1996/files/dark_souls_2_soul_spear.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_off00008aa1.bin
8b3586ce54853cd08bbbae9380bb49c987445afa8682439c993fba6d4da8818c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA1 5780 bytes
font_01_sfnt_off00009e2a.bin
71f4503ed0e7657782420277a1aecf9ea043cf96697a248c2fdc6c0abeee16bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E2A 9792 bytes

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