Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad6ba252c8bcb98…

MALICIOUS

PDF

69.7 KB Created: 2020-08-16 22:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98a5732395324e01b20a1c20c6fe61b8 SHA-1: 25fc2beb110f64db8e51e3b8bbffa96d80d478fe SHA-256: 5ad6ba252c8bcb98a42077b35eaf914dcc4d839bb599046d9e7e1d50d87e7d97
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 external resources, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.com/pify?keyword=electromagnetism+class+10+icse+questions+and+answers', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, indicating an attempt to direct users to malicious infrastructure under the guise of educational material.

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.com/pify?keyword=electromagnetism+class+10+icse+questions+and+answers
    • http://xadiwal.microendeavors.com/uploads/1/3/0/9/130969679/00370e719219b.pdf
    • http://files.mkquilts.com/uploads/1/3/1/4/131483019/e29292478e70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6220/6357/files/55241409807.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/62560267687.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/diwuwezise.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0836/files/cell_structure_and_function_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/17210331045.pdf
    • https://cdn.shopify.com/s/files/1/0432/3403/3824/files/kasodoram.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/74602744128.pdf
    • https://cdn.shopify.com/s/files/1/0450/1300/8534/files/ap_calculus_ab_review_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/7778/8057/files/plutie_irisa_ffxiv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3c8.bin
c1357837b5698336fc4e8c6db9821806ad30774eb160faf9a8829373947a9a93
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 5628 bytes
font_01_sfnt_off0000c6d8.bin
03f92e1177bdbf55e296d6ac8e7e58d8d9c84c107896a07f37714e23935a94a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 14592 bytes
font_02_sfnt_off0000f449.bin
51b8d4c4f17389d80b23040d591c0dccb099bca9103ea84f58116e310badbe13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16088 bytes