Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb105adce5762a27…

MALICIOUS

PDF

53.1 KB Created: 2020-08-29 20:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea10732f16f881d2158d748d4ced27db SHA-1: c9b13715ca4bf66c3734697e7d30662c95a57f10 SHA-256: bb105adce5762a270a8cbfe86f36800cc59ca44b9dd2f32aed9627fbec89c056
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=purpose+of+reunion+2015+sub+indo'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with 'https://static.usrfiles.com/ugd/0d002d_128e1577ee8743fdb1027ed409a3b6b9.pdf' being the first identified. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded links suggest a phishing or redirection attempt.

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.ru/wix?keyword=purpose+of+reunion+2015+sub+indo
    • https://static.usrfiles.com/ugd/0d002d_128e1577ee8743fdb1027ed409a3b6b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_92643ab8a8d8469095dfdf546edb9ea5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a34f25398c34df9b1a99cc4e235aec6.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/52763602957.pdf
    • https://cdn.shopify.com/s/files/1/0431/4290/6007/files/pagaku.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/81017397776.pdf
    • https://cdn.shopify.com/s/files/1/0448/2465/8082/files/tasufige.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/jexogawimorosizazogudafe.pdf
    • https://cdn.shopify.com/s/files/1/0440/0414/7350/files/61244064142.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfc587d6c35a4f17877ed0369fc95c21.pdf
    • https://static.usrfiles.com/ugd/b8c837_708fe6c2d1b544dd839c8f4c871f41a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e93bba4aaf294c8580a8d5815231a183.pdf
    • https://static.usrfiles.com/ugd/136d07_b98a5de41d1449929f1216e3b3511133.pdf
    • https://static.usrfiles.com/ugd/f80014_c87e55a3b9eb4f76b116251b57ecf6de.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_off0000715b.bin
a23b9d5173430b91bf94d94f5eed059e9be3879adac5c6dcc63b1e57c63ae2ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715B 10884 bytes
font_01_sfnt_off000092e1.bin
e8899792247624a3f8363d1e82754ec898a46ef60674aaafa8bfb4e6e3b5907a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E1 5384 bytes
font_02_sfnt_off0000a544.bin
8b4817f975185707d1b4b64e3c312177bb13cc17f3b32ba774c4b371437bb16c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA544 9940 bytes

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