Malicious PDF — malware analysis report

Static analysis result for SHA-256 39964f9b9a174f9b…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 21:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 330777e60ee8fccccbd5d46b6e300c9a SHA-1: c60d17a201130d2fcd52b20f85e89a9aebc544a6 SHA-256: 39964f9b9a174f9b60109b4038d7b203bae999b5dde916c9f5f6542e1c3fcad9
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains text related to 'Android app location permission' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other links to static.usrfiles.com, while individually benign, contributes to a link farm pattern.

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=android+app+location+permission
    • https://static.usrfiles.com/ugd/c12414_009453eae8cc4b7094d86433025d027e.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd9be588ae804c20a4f678ac1c68a87c.pdf
    • https://static.usrfiles.com/ugd/b8c837_596eac91c3754e41a552bd17dde78c53.pdf
    • https://static.usrfiles.com/ugd/5ed537_5d99f030ad9c4d1788227058f8cc7465.pdf
    • https://static.usrfiles.com/ugd/2ac701_58c519f0624a49d5bf25eb9ec0a64728.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef21ab562a21423da427b2b5f7edfb67.pdf
    • https://static.usrfiles.com/ugd/9ea91e_ee7cd5c193664d7b8188e03d7bdaa1a7.pdf
    • https://static.usrfiles.com/ugd/cc03df_3aaec4d1810442c29a2b0b4d33c0d1a3.pdf
    • https://static.usrfiles.com/ugd/1b8612_4f7a6523bda84ac18a8d0163f86d564b.pdf
    • https://static.usrfiles.com/ugd/0511f5_b335396052254c63a4e6cd5a85760dda.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_046bbe880ae94bbba8c1208b658a585d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6709bc75bdb48f1aad4cab8ec6c77ee.pdf
    • https://static.usrfiles.com/ugd/2f07a1_c0b0114860a5443b91ca8fba240c7e26.pdf
    • https://static.usrfiles.com/ugd/87a178_9b1308f351fa401faa421c3273d0f593.pdf
    • https://static.usrfiles.com/ugd/b8c837_63aad2c1a8234b43a7d25d63c193b7e7.pdf
    • https://static.usrfiles.com/ugd/269bb8_2f464e7caf284e3eacc142e17545ac5d.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_off00006743.bin
e955d58ea1b25add427f8b74955cc0c2114f5d47825a4d74e94c71d52ba04b09
pdf-font-stream PDF embedded font (sfnt) at offset 0x6743 5208 bytes
font_01_sfnt_off000078e5.bin
6d6636adf5cd2b4ee464a906156790e15e0824e96769b26dd0879a86d021193a
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E5 10216 bytes