Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b29fc85281af1b…

MALICIOUS

PDF

34.2 KB Created: 2020-09-01 01:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a5eb2e1ec19478af55728bf385a3a4e SHA-1: e378da1e63913c7ede5e55eb44d880b5aed21b86 SHA-256: 16b29fc85281af1b355dd25481cd0493de8a43c8911f7f790263e88c8f964dd6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL, 'https://ttraff.cc/pify?keyword=brothers+songs+in+tamil++masstamilan', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, suggesting a link farm or SEO spam tactic to drive traffic to malicious sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a malicious intent.

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/pify?keyword=brothers+songs+in+tamil++masstamilan
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/sazabifilawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/zakirinumusugaragibamix.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/mapenudav.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/invoice_template_uk_online.pdf
    • https://static.usrfiles.com/ugd/12daa7_2f5fcb5766514a44813824f4b819b2d8.pdf
    • https://static.usrfiles.com/ugd/a48928_97ae3fb2c5804dca958a294e8aae272c.pdf
    • https://static.usrfiles.com/ugd/865d50_7c5f0325325a4df180c60300d0083ea3.pdf
    • https://static.usrfiles.com/ugd/9b5f63_f1188ec4407b4e94bdc8da671078a112.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/panchatantra_short_stories_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1536/2984/files/80336446871.pdf
    • https://static.usrfiles.com/ugd/b8c837_30d116d5c4464b2aa41efacc73b5b770.pdf
    • https://static.usrfiles.com/ugd/cd79e3_882fa01611ac475192b5132cd648ae58.pdf
    • https://static.usrfiles.com/ugd/111c46_ca17f87c235944488d2ed5929e4ae74a.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000480e.bin
c2d3026a70cb1f02dd021d082b6def4709d872b872b1779ff65fb31585327015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480E 5148 bytes
font_01_sfnt_off00005966.bin
37961cddaca8304091b8429ec3e0bb2fb8c119e610df3c456c0ad3b897435d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5966 10080 bytes

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