Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d819230ccf8e101…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 19:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc38715ab6276a55269756a7faf7f8d4 SHA-1: 97a26f710d947390c040d4f79ab54491314cf77c SHA-256: 3d819230ccf8e101bd3de85bf3d53d4bf5ca8bc625b1e76509ac02c38707af4d
152 Risk Score

Malware Insights

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

The PDF contains a high density of links, many pointing to external resources, which is flagged as a link farm. One of these links, 'https://ttraff.cc/wix?keyword=master+cleanse+spanish+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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=master+cleanse+spanish+pdf
    • https://static.usrfiles.com/ugd/dc8a8e_f7e29938110b48bcbb7f5b098275547b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9df642da5774e1194a80f0934fb8a8b.pdf
    • https://static.usrfiles.com/ugd/8de238_2e95c81154d84d5685823ca454734ab9.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_7fd8c080263448d6b9a343abc31e3688.pdf
    • https://static.usrfiles.com/ugd/b8c837_423f1dee98b64e0db23e64b60ffe3dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_93d019b8bbcd4ebda7b4fe1d0639c6ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed90f2a3be8542cda28f486d9cbf2f16.pdf
    • https://static.usrfiles.com/ugd/cf79db_9c478883e008438ca8e2818f4b3af186.pdf
    • https://static.usrfiles.com/ugd/b8c837_3192a14a0fbe4f5593de9274581fa9d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0c51820f48f492b9c12623f66e317ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_7512fdf9bc5245d49cfd1570251fa20f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f726de9f536747beb94008c7e6e6d8bd.pdf
    • https://static.usrfiles.com/ugd/eb4c03_3b626737aff24e4696fe978604c8ba33.pdf
    • https://static.usrfiles.com/ugd/b8c837_43c840659fd2480593c52aa8e440cea8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e140007085bc436899dd611ba47cae93.pdf
    • https://static.usrfiles.com/ugd/10b11f_9ecf4144b61a414fa706c577f840bf26.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_off000062d7.bin
82c636ccff481c04b54ab054d9f28d2b4f4995f3de5d0a94710a1b1d4e362066
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 5248 bytes
font_01_sfnt_off000074a2.bin
95cf09c3e72898fd63cb38e5f2fd05a579fd64acd9831000a13a1ec6b28d0ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0x74A2 9984 bytes