Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32ca38c4dd7d46b…

MALICIOUS

PDF

56.8 KB Created: 2020-09-07 21:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d6161cf8915ffe51b60716093c0c105 SHA-1: 94f20de6b0c8967065bee2a3f8a3385e92d08f0a SHA-256: c32ca38c4dd7d46b2b5e9773402b1504870fcda103b329ab5225e61896bd64bf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'Bmw m340i pricing guide' and the malicious URL, suggesting a lure to trick users into clicking. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=bmw+m340i+pricing+guide
    • https://cdn.shopify.com/s/files/1/0433/4102/1334/files/72649462283.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/xcode_code_coverage_report_jenkins.pdf
    • https://cdn.shopify.com/s/files/1/0432/9799/6960/files/74508508564.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/vevavune.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/ateles_belzebuth.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/save_game_resident_evil_4_biohazard.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/68960109817.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1062/files/lakuzaralomekuridun.pdf
    • https://static.usrfiles.com/ugd/1df9ea_1c239e5ab96443a3a80fbad6c2567502.pdf
    • https://static.usrfiles.com/ugd/53cfc7_6f9d67e893a0493ebd44f9e8d358b564.pdf
    • https://static.usrfiles.com/ugd/1e557c_c106eb291f1949b6b34ddf245222d9e2.pdf
    • https://static.usrfiles.com/ugd/7a11b0_1d0d8b871cc04e60829251cf90a27f8f.pdf
    • https://static.usrfiles.com/ugd/41f880_5c03bb3a46dc473b93b683d273591f7f.pdf
    • https://static.usrfiles.com/ugd/cb5dea_0d8825fad7314a64b85a87b448bfc5ba.pdf
    • https://static.usrfiles.com/ugd/cd1d52_0fc0ac2e184b439e8a013c5a20cfb046.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080d1.bin
a45a20f2081cc5419b896c5e1070dfa2a13b2b48cfd659b6e8c6b54c9c23efd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D1 5508 bytes
font_01_sfnt_off0000939d.bin
1effe78314c44e63123803210323ef07393a9401e5e6a510b387496f01bbe293
pdf-font-stream PDF embedded font (sfnt) at offset 0x939D 14528 bytes
font_02_sfnt_off0000c199.bin
3088de61ba4d2b01ab234d84e40a42107c4d30a52b1b9bdaf8961d49da71d313
pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 16076 bytes