Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bef86de59d42c2…

MALICIOUS

PDF

44.8 KB Created: 2020-09-07 11:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd27f77610d7e4c3bf1510e6ff0d2c38 SHA-1: d9c34c9f00291506e452ff701d37eb6b4a59bdf1 SHA-256: 50bef86de59d42c27ece36a8a51386349d6e23055783ac1d633362f8c00841af
150 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.link/wix?keyword=java+8++for+32+bit+windows', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to 'Java 8 for 32 bit windows'. The presence of a link farm heuristic further supports the malicious intent of directing users to external, potentially harmful, content.

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.link/wix?keyword=java+8++for+32+bit+windows
    • https://static.usrfiles.com/ugd/12f4eb_790f0be31f05445db7671790e7d4f572.pdf
    • https://static.usrfiles.com/ugd/77eba6_759f88dcbad94d0bbe8c849ccd26694a.pdf
    • https://static.usrfiles.com/ugd/6f53d7_1265c8a1084743e581cc477ee610cb82.pdf
    • https://static.usrfiles.com/ugd/b8c837_75ab08b098444edba480403e2c7413b3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soreluseloxajakikolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/ncert_beehive_class_9_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/tusisozaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/vuvikarajesorudovud.pdf
    • https://cdn.shopify.com/s/files/1/0462/7736/1824/files/chase_credit_card_travel_notification_form.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_off000063a5.bin
61424efc6933c39139d17b25edc0d5ae2e92f62e3bc794b26967b5a4ae680868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A5 5312 bytes
font_01_sfnt_off000075c4.bin
5a52ddd2e343d9beffde562ca491c355a36dafdd31b82d222dfcd022af047136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C4 10296 bytes
font_02_sfnt_off000098f0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F0 4324 bytes

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