Malicious PDF — malware analysis report

Static analysis result for SHA-256 227e2fdeaae8d99f…

MALICIOUS

PDF

62.9 KB Created: 2020-08-13 15:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b099c54063d04f4d367af058e6eb0cb SHA-1: 85e73f368401b0e4c18e095f393281d46d57d0d4 SHA-256: 227e2fdeaae8d99f2d3dde14991a99edad0fa87ab030e60e5d4bfadcf0af6451
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external links, indicating a link farm designed to distribute malicious content. The ML classifier strongly supports the malicious verdict. The primary malicious IOC is the redirector URL.

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.ru/pify?keyword=%25E0%25A4%25B0+%25E0%25A4%25B7%25E0%25A5%258D%25E0%25A4%259F%25E0%25A5%258D%25E0%25A4%25B0+%25E0%25A4%25AF+%25E0%25A4%2597%25E0%25A5%258D%25E0%25A4%25B0+%25E0%25A4%25AE+%25E0%25A4%25A3+%25E0%25A4%2586%25E0%25A4%259C+%25E0%25A4%25B5+%25E0%25A4%2595+%25E0%25A4%25AE+%25E0%25A4%25B6%25E0%25A4%25A8+%25E0%25A4%2587%25E0%25A4%25A8+%25E0%25A4%25B9+%25E0%25A4%2582%25E0%25A4%25A6+pdf
    • http://files.brandywinefarmllc.com/uploads/1/3/0/7/130740033/biluxe-turudul-wovuked-gezarivedegodib.pdf
    • http://files.veteransmusicfest.com/uploads/1/3/0/8/130814342/fifexobed-jalafeg.pdf
    • http://files.ohenrymustangband.com/uploads/1/3/0/8/130873907/sujas.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/tevizit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fonufefijosogigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/be_smart_english_workshop.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/66442773384.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/28482348162.pdf
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/sobivupetep.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/ghatna_chakra_gs_book_for_ssc_in_english_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8233/files/33865828765.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/internet_advantages_and_disadvantages_points.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/calculus_with_analytic_geometry_howard_anton_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/5961/5646/files/19501380686.pdf
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/21959510465.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000babc.bin
a021432cfa63132515b77518037ac2d655372043b9087c7bf75a26c6602214e5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBABC 16772 bytes
font_00_sfnt_off00007fd5.bin
d660e4c0f1b7cef5d3a7f88c3c47983c9054fc81190b2cd2620317eafb2ca87e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD5 4424 bytes
font_01_sfnt_off00008ef7.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF7 3720 bytes
font_02_sfnt_off00009a59.bin
e42365baac6ea5bec85f7e873e24ce3a6795685e05fd76dc101d311c9d91ef58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A59 9408 bytes

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