Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85146c2f97f06d8…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 22:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e723b490b2edd7f2bbe41a23c6abe58 SHA-1: 0c0b989b4915c74460f31c4f45acc8381c9c82d6 SHA-256: c85146c2f97f06d8680650ae45eef7c4ef3d7a042df54a9176f800972f29e9b0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. This suggests the document is designed to lure users to malicious content by obscuring the final destination through multiple redirects. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=apple+configurator+windows
    • https://static.usrfiles.com/ugd/b8c837_b1b6dd5e34a34c318935621fec93e880.pdf
    • https://static.usrfiles.com/ugd/857e61_108a1ff0e17a4d7dbc8b91fd71c99ddf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f26783c5898343659938d719a5737507.pdf
    • https://static.usrfiles.com/ugd/45e30f_f1640ed4c3f04edebcda7c7dc2993b31.pdf
    • https://static.usrfiles.com/ugd/ce5d00_6dbaebec448940e1885961fd3cfa7da4.pdf
    • https://cdn.shopify.com/s/files/1/0432/2780/7908/files/alaris_8110_syringe_pump_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77439678162.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/nicki_minaj_trini_dem_girls_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/36528483538.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6589/files/66329735250.pdf
    • https://cdn.shopify.com/s/files/1/0434/0881/8333/files/paxagupikajazukakidakijo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9461/files/75632605001.pdf
    • https://cdn.shopify.com/s/files/1/0435/2288/3735/files/9501830138.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_off0000681a.bin
d492b7e0bb23a2ed15fc45413d6e07046919aadb3b671a748d42b0d6906627fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x681A 5404 bytes
font_01_sfnt_off00007a9b.bin
d8e59171de88c7ddbe7d6b24976684f224f8810c725e3a4605b48386a8f13027
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9B 10092 bytes