Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a1ee6fa14a1f02…

MALICIOUS

PDF

45.3 KB Created: 2020-08-30 04:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8bb6f2c5ad80c8da0a7acfe0e25a934 SHA-1: b052277cf02a3661e038e9eb615b2e923e25a049 SHA-256: 50a1ee6fa14a1f02c31ca8fe30e7b85c25fd75cdf5d41b9eb88368c7f6ab08de
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The file is likely designed to redirect users to malicious content or initiate further downloads.

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.com/wix?keyword=ad+hoc+and+sensor+networks+notes+pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1702/files/mapa_geologico_de_el_salvador.pdf
    • https://cdn.shopify.com/s/files/1/0444/0460/5094/files/brentuximab_vedotin_fda.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/98473943572.pdf
    • https://static.usrfiles.com/ugd/5b5da7_3a39f3c3f47d41e98906b57ff662b2c7.pdf
    • https://static.usrfiles.com/ugd/e1c37d_b2155c79fd95414595302b6066b0635e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab2b05f74c414cb7b4fb22603b6603d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d2de1530d9a40f7a8d9d9c9c6652491.pdf
    • https://static.usrfiles.com/ugd/345929_9a698d79c7be46fd92b2159c6b3dd83d.pdf
    • https://static.usrfiles.com/ugd/b444d4_d62f34a42b8d47168a6417c726b68748.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d400996ab0e4c05ba85024b67e10cf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_286d42d3721b4a818ad156a9620b876c.pdf
    • https://static.usrfiles.com/ugd/23b571_5caaf7fe98cb4656b8429e089aefd8a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_023c3f9e750b484f8a16210357773a9f.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_684320131952435598cf812fa8b719be.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdb8c915d5d04509a775216ffb8b7c2c.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/
    • https://static.usrfiles.com/ugd/b8c837_6d2de1530

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007218.bin
83b0aa59008bfd6898ab967360661dd726cf229f7fb99d21e702bb3fc15aa05c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7218 5356 bytes
font_01_sfnt_off0000844e.bin
ae84adb710f209a807411eec2702ef68a72995b2c011ea2f4d9b7929a0e40e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x844E 10772 bytes