Malicious PDF — malware analysis report

Static analysis result for SHA-256 24575f0f789ed76d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 07:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5e21c9c84906214cded8e0382504f2 SHA-1: bf9b331b95c1d2cb61d7a8d421a00d16c73d93e4 SHA-256: 24575f0f789ed76deb5e6be6cf43c30aad9ff03016a059e7010ffaf5d762e195
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to a URL that promises a free download of 'prison break season 3'. This URL is likely a lure to download malware or redirect to a phishing page. The document body, though heavily corrupted, also contains the same malicious URL and references to downloads. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to static.usrfiles.com.

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=prison+break+season+3+free+download+full+version
    • https://static.usrfiles.com/ugd/b8c837_624098937c8848638727b0fa276830b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfaa338034b746f7a4c2e5beacc168d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8842bec2de24456a8403725306eee8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c30d319571043b181911b6d6f49b551.pdf
    • https://static.usrfiles.com/ugd/b8c837_517bb12ce35b4db5bed64280fa04d8ff.pdf
    • https://cdn.shopify.com/s/files/1/0463/0482/1405/files/gsm_aladdin_crack_download_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/5657/9228/files/laterally_unsupported_beams.pdf
    • https://static.usrfiles.com/ugd/b8c837_64b608b7bbc74c3aabf78f18ce281792.pdf
    • https://static.usrfiles.com/ugd/b8c837_762337e21b2b4b40bb75596da384d484.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7daad746264437b8104b43f5a50dc1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5e70ac7081e4bd6b0dd057354b0faff.pdf
    • https://static.usrfiles.com/ugd/b8c837_6690fb169f5d4519ae7e6e9a55f3cb58.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/gedamamu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1212/0998/files/pimofuvezojozo.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_off00006127.bin
d22f552561d072a86105297b91668b9253043f3818b86111e131638b0465060b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6127 5420 bytes
font_01_sfnt_off000073b5.bin
0abc551544a2ea46c66f78431dc6c4defdce97436c09b8f6cdc9f1f8aa0dc992
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B5 10872 bytes