Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dbaef3108affe2…

MALICIOUS

PDF

34.1 KB Created: 2020-08-29 05:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3d5cf710d2d13ad8498bf2a34c1dce SHA-1: eb371b06d944b24e32adca011959b51e00e799a2 SHA-256: d5dbaef3108affe268aab8ea6de18e172241e854561b1e3b6cdada0a9ebcb7c2
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links. One of these links, 'https://ttraff.link/wix?keyword=carta+pai+bertingkat', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links, suggesting a link farm designed to lure users to malicious sites.

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.link/wix?keyword=carta+pai+bertingkat
    • https://static.usrfiles.com/ugd/b8c837_8a0b6046ad114dd39fdaab408f25ea4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_362ce055998348668a5072dc3eb203d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_cda10bbc811843f98571a08821e9bc55.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f9bac77e7bd439588c58f39a9531f0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e62dca9eb4164cc580e4e8856dd25dcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6bbdb41acef4acc80fa663ea4177519.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ecce2c2441a42d0b8ca3ab46d43b0e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0003d6e7db749eeb8e3909d91259118.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/kobufilimujaxudorejedev.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/16431048607.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3587/files/loxujomitokoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3263/files/rusojemevewexaxis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/rivefujuzavovetu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1060/2661/files/mawarufoxitafoviruwonobo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/king_platform_bed_frame_cheap.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_off000049f5.bin
d4f3c8bcd45d0058e862d7045803a93d0f999e6b0e7505d4ad70722a51da2d99
pdf-font-stream PDF embedded font (sfnt) at offset 0x49F5 4884 bytes
font_01_sfnt_off00005aa6.bin
8ca3aedb13dc213b401e07e86081070cf02d3a75da93bf4b9b86924ac5d0313d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA6 9756 bytes