Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758924eaa421f13…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 14:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 337272275cd0abf628c8df27f4ccfd0d SHA-1: 476e6be5987fc2093538ffc08c6d82d61bac2dec SHA-256: c758924eaa421f136d8731f3d3b7cf88a0e9f1d75d6cb46091a92d7f6dda7f82
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search results or distribute content through a link farm. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=dauntless+endgame+guide
    • https://static.usrfiles.com/ugd/b8c837_7a97b535424944388ee9c23b16124b08.pdf
    • https://static.usrfiles.com/ugd/d94ae5_5f66570ebce1408a8d84a14eb42554bb.pdf
    • https://static.usrfiles.com/ugd/b914b5_419b4604a294444292000d66e001b87a.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b3841e60a445598df8d3c5c2635e84.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4bc4cbd660640e69b3ca07eab886e1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_304c82db875343c7814cc21b1dfc30bc.pdf
    • https://static.usrfiles.com/ugd/538d67_caa5c0b89c194bb0ae8e9ec1eef2b585.pdf
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/10862532996.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/wisuzokiva.pdf
    • https://cdn.shopify.com/s/files/1/0463/2861/0971/files/pevodilifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/21383419863.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5831/files/apixaban_bula.pdf
    • https://cdn.shopify.com/s/files/1/0446/7389/2515/files/boris_pasternak_dr_zhivago.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/xudapavuruwujegukera.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/94330735426.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a2b.bin
587767a04141f813f59d6b1090d8d036e70d9d65f484fa4970aaef6fe546c191
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2B 5048 bytes
font_01_sfnt_off00007b4e.bin
a650d180dec8504dcc93ad72f6aa3b07d311291a710b79361ab0ed93704bee28
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4E 10380 bytes