Malicious PDF — malware analysis report

Static analysis result for SHA-256 15211987cad5ae43…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 06:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9d56b083543c8259965c24e4434846b SHA-1: 19ecb00db16258ae8788e12cd262211fe1a7bcee SHA-256: 15211987cad5ae43d371e7c392fb2dec65a89b5e76d3cc40040d9294f8e8cc1d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or host further malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful sites.

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/wix?keyword=mns+hotmail.+com
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f967ac_3d1e15c0190d403f8a90af584ed70e0a.pdf
    • https://static.usrfiles.com/ugd/221f3a_8c057d922231482880fac83f29a39505.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8d40e50d2f46e5bb57cdfd841dbaab.pdf
    • https://static.usrfiles.com/ugd/8acad3_df3019de27f249d2a0a078ba3eb233d6.pdf
    • https://static.usrfiles.com/ugd/f967ac_578d1de502db44c484796aba55a08a62.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4506f7c46214facacc6fc0c8b826402.pdf
    • https://static.usrfiles.com/ugd/270e53_569e6a31d4f646c480708fba0028ee19.pdf
    • https://static.usrfiles.com/ugd/b8c837_d72d9c8efb3e48e99333aeba60e3e381.pdf
    • https://static.usrfiles.com/ugd/4c1554_f40f10895cb14db9bd7dff5377525bf7.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5517/files/water_supply_and_sanitary_engineering_by_rangwala.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/fuun_lion-_maru.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_off00005a52.bin
edbd7dd484c9e7920958f40778726304a4a0ad2935569b85ad13e0fefb7b2236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A52 4980 bytes
font_01_sfnt_off00006b16.bin
7fe82b4a1b3480a32529655f90743384d4b6ffa3fc83824378beae72f23101d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B16 10360 bytes
font_02_sfnt_off00008e76.bin
efefdffb8153527adb96f8e87fdb42851e2b03968941913d97c28521121c9c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E76 18288 bytes

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