Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54c250e5b284c0e…

MALICIOUS

PDF

35.0 KB Created: 2020-09-01 15:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac2e20e13551651ea3d3417466159a5 SHA-1: 4001dcbd637580c59102b05c37359f6c2188d6c4 SHA-256: d54c250e5b284c0e476099152fce5b421aa51150f6759a802ad9f8d7463ef014
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.com/wix?keyword=caldera+spas+cantabria+manual', points to known malicious redirector infrastructure. The document also exhibits characteristics of a link farm, with many URLs pointing to external PDFs, suggesting a coordinated effort to distribute malicious content or engage in SEO manipulation for malicious purposes.

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.com/wix?keyword=caldera+spas+cantabria+manual
    • https://static.usrfiles.com/ugd/3826db_738963c2304d44bd9a32a2b8c931c05e.pdf
    • https://static.usrfiles.com/ugd/5af86b_beb43b15b2df491483a5af5b620ca3a5.pdf
    • https://static.usrfiles.com/ugd/99965f_f15bc015f6ca484e9f417a1d5b4d9f77.pdf
    • https://static.usrfiles.com/ugd/bf650e_61e5adad98a04e3fba940f70b6ae0775.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/dupopibipalowidul.pdf
    • https://cdn.shopify.com/s/files/1/0438/5875/5749/files/zenajokutorejotavexete.pdf
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/bonivilojutop.pdf
    • https://static.usrfiles.com/ugd/ce77c6_036b366ae5fe41448ece028e2eaecb39.pdf
    • https://static.usrfiles.com/ugd/12f4eb_b7b8f769ead74f6d8cf8ce549f2d0ffc.pdf
    • https://static.usrfiles.com/ugd/b8c837_45d127f7681548068b15fb56c7872518.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0580a59b5d24efdaaf91aa64aa08d9c.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/nogorifobedij.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/bahubali_picture_film.pdf
    • https://cdn.shopify.com/s/files/1/0431/6440/1818/files/jixubigobobofiwasuwinod.pdf
    • https://cdn.shopify.com/s/files/1/0449/8341/9039/files/mujadepazoja.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/tiverepafopuzakaz.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_off00004a15.bin
af1787ae2936edf608ef18d1b549db7b5d351e207b3132484b7a79eafd602ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A15 5264 bytes
font_01_sfnt_off00005bd6.bin
733177b7810f3439b66fdeb474d482c4435dd4007c806c4a3e1a94085f569f15
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD6 10364 bytes