Malicious PDF — malware analysis report

Static analysis result for SHA-256 8489f7fca1dd9d04…

MALICIOUS

PDF

44.8 KB Created: 2020-09-01 16:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1739ab829b7d13d39d4f7c115a225cc5 SHA-1: d5787d6181780c152170ac3736103fe4be77cee4 SHA-256: 8489f7fca1dd9d0477473537533fd00ed6232ac17758b2d5393a790d7bd1995c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that leads to a known malicious redirector. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

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/pify?keyword=phrasal+verbs+exercises+with+answers+advanced+level
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/808d8c_34b4c11cac834ffa8f4fda92424cad57.pdf
    • https://static.usrfiles.com/ugd/1813b3_f8f40e6c4a9d4229a69d20904d40ca35.pdf
    • https://static.usrfiles.com/ugd/2c7c49_2d7c034f06dd419489852b7f2c9372d6.pdf
    • https://static.usrfiles.com/ugd/9734e7_333edb3a70b343bab1316dbe99bcb4ca.pdf
    • https://static.usrfiles.com/ugd/2e16aa_bb20c2c0645f4eda901c1aee799219cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_12323188d51041a4a001db77b7d4e350.pdf
    • https://static.usrfiles.com/ugd/a771bd_8b4c12df35c745cf85983b4c67b15eb5.pdf
    • https://static.usrfiles.com/ugd/738632_b802aeac429e44a09976a38b1294c2f2.pdf
    • https://static.usrfiles.com/ugd/5be868_9639f71a85c04848aa5c137101c17022.pdf
    • https://static.usrfiles.com/ugd/d4579c_322cce1dfb1f4f79bbc8a1546d735b6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fa2535818694b81aceba3a3a302fe1d.pdf
    • https://static.usrfiles.com/ugd/d54300_4d6f2f9f4838405490f7e67acf2ea8c8.pdf
    • https://static.usrfiles.com/ugd/0511f5_1556e345419048cfbf62636fc66d4293.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e19.bin
7b596a95a57b21c6ba840a5198914d1d987e52afa877bb2ff3df3cc873a31ed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E19 5068 bytes
font_01_sfnt_off00005f54.bin
2995eda348954c309a207aae69827535551a64bd36d247f7b7222e04a1861d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F54 10296 bytes
font_02_sfnt_off000082e2.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E2 16092 bytes
font_03_sfnt_off000097aa.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AA 4324 bytes

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