Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee062f25f5653fa…

MALICIOUS

PDF

43.2 KB Created: 2020-08-29 23:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4fa985636d1ce9152e684db3da2b8fa SHA-1: e7cae6b91182576ed1cc3ca18f96d669b805326d SHA-256: dee062f25f5653fae2248aa9e308a16479931f47e2426d0a8ec904deadc325a6
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 ML classifier also flagged this PDF with high confidence. The presence of a malicious redirector suggests an attempt to lure users to harmful content or further stages of an attack. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

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/wix?keyword=t%25C6%25B0+t%25C6%25B0%25E1%25BB%259Fng+nh%25C3%25A2n+ngh%25C4%25A9a+trong+h%25E1%25BB%258Bch+t%25C6%25B0%25E1%25BB%259Bng
    • https://cdn.shopify.com/s/files/1/0439/7904/7070/files/lukogomubonerijedirubik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/62176773753.pdf
    • https://cdn.shopify.com/s/files/1/0466/3033/8725/files/bottle_label_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/wuronuguxowadawimulozik.pdf
    • https://static.usrfiles.com/ugd/0f5b72_a19524a79d7f4b5a888cc98fcfebb4a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdd3d76c3f8547e69e103a70e265f844.pdf
    • https://static.usrfiles.com/ugd/9374a7_92c1f27958ba4826aff2751c80e57d24.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba39d38279e84b8c9aad870bf86578b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_afee9af970f54e318101ba4a7c456c42.pdf
    • https://static.usrfiles.com/ugd/8b97dd_cf0cfa2524f34c1a9fffa8480ac55797.pdf
    • https://static.usrfiles.com/ugd/b8c837_54e8b102048c4dca9b8bdb9a244ef5ac.pdf
    • https://static.usrfiles.com/ugd/8de238_515e161b314a46ba8097dec912b487f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_49125088aa2249d98fcd5d7697daa921.pdf
    • https://static.usrfiles.com/ugd/ca300b_1da6cfb89c754a029158d98c82548cc0.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_off00005e0a.bin
d23f57511a0411eac0cf06f4ad426d3b3dc52c4ea9cf8d9f6ffadc18130a9ada
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0A 5736 bytes
font_01_sfnt_off00007063.bin
6b0d20671f46f2a9e9bba78de631f233bd85191f6fe6ba299764c8d18488532c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7063 21372 bytes