Malicious PDF — malware analysis report

Static analysis result for SHA-256 051c5e5ea3fa2766…

MALICIOUS

PDF

45.5 KB Created: 2020-09-07 16:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c27f93c7e5667b39c9cb4bf1d4520b36 SHA-1: 97c009155424bbb10678e2a357ae172be65c7776 SHA-256: 051c5e5ea3fa2766288b3800537f7893fdcae7813ca6c693fa77143b7ecb92e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to educational materials. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

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.link/wix?keyword=color+by+number+math+worksheets+for+kindergarten
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/eb6612_c3c074e4e032493ea760a16d75a94e4e.pdf
    • https://static.usrfiles.com/ugd/185811_bf4814ee1d23415e955c4bf5f7966c86.pdf
    • https://static.usrfiles.com/ugd/738632_2da2c4f81c0348c4b3644bfe2f8d2e5b.pdf
    • https://static.usrfiles.com/ugd/d954c5_1f826d3c36d94fd18e6c47dca6429e9d.pdf
    • https://static.usrfiles.com/ugd/c63bf9_4824b714dc71447386d7fb553d916df9.pdf
    • https://static.usrfiles.com/ugd/9734e7_9664fd5120eb4c31a419c84cbebb25dc.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_59e0896a55124523a9e6f13006e77d54.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8136/files/algorithms_robert_sedgewick_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/read_text_file_into_2d_array_c.pdf
    • https://cdn.shopify.com/s/files/1/0462/7736/1824/files/backup_and_restore_android_google_account.pdf
    • https://cdn.shopify.com/s/files/1/0462/6674/4994/files/togape.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/devoluzitid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/tezibabomuraxutofiw.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_off00006400.bin
5a1030d062e64f37870a471b884e1e3b661651ceada078fe2d29e58392c170c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6400 5624 bytes
font_01_sfnt_off00007707.bin
250d5b9ef906ef0e64018ff1db399664389f5a67f9c5bc907da27e17e8dbba3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7707 10620 bytes
font_02_sfnt_off00009a8e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8E 4324 bytes

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