Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c39db85160b17c9…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 14:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1372c9a856375f76078efbecade5a85e SHA-1: 5f054011dd0ca8996d018e283fd98c827c20289b SHA-256: 5c39db85160b17c92a72a24404a8ffeb561e591623902e889a1f1e5b70e1f894
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=boat+browser+pro+key+apk'. This URL is likely used to redirect users to a phishing page or download further malware. The presence of a large number of external PDF links, many of which are benign, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. No scripts were extracted, but the PDF structure itself is deemed malicious by an ML classifier.

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.cc/wix?keyword=boat+browser+pro+key+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bfbc46_9e1eebe60cae4ff188118fd38b837f69.pdf
    • https://static.usrfiles.com/ugd/6cf392_216d9c1a20e6460cabbb4796cfea38e1.pdf
    • https://static.usrfiles.com/ugd/6c032c_52896176589445eabe2043250ab56777.pdf
    • https://static.usrfiles.com/ugd/b8c837_07194948e0f94b1e95d745f6ae29c3ba.pdf
    • https://static.usrfiles.com/ugd/a382ee_4d77fefa726c4848a2490516d8f0f5e6.pdf
    • https://static.usrfiles.com/ugd/a48928_54006962ec3747baba61d56f4d62a485.pdf
    • https://static.usrfiles.com/ugd/af0aa9_685b4c0768de4fd891b4d3db7674c21c.pdf
    • https://static.usrfiles.com/ugd/f09a9d_e24f16a024b246f3b9cd8b4a5346706b.pdf
    • https://static.usrfiles.com/ugd/5e81b9_34fc37b33be7482688b7fd6889a78087.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/hitachi_absorption_chiller_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/xawonoruxuxonetagodomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4345/files/1437340282.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aff.bin
d075c8ce86a7c3bd86d930fab5465ac7a9927243d3015c2d6751b6a60bf0cfd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFF 5228 bytes
font_01_sfnt_off00006ce7.bin
68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE7 1796 bytes
font_02_sfnt_off00007572.bin
4e4853753f266d7e2e3e0f1244ea5f7fa7cba7ac58181e5955ba8c8c0a898762
pdf-font-stream PDF embedded font (sfnt) at offset 0x7572 10304 bytes