Malicious PDF — malware analysis report

Static analysis result for SHA-256 c527c4a013ec3afe…

MALICIOUS

PDF

46.1 KB Created: 2020-08-22 14:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324fd737ad9372071b71b2ed625a1a3f SHA-1: ce485ea0897356be67d2e3c69a242eed32a489b8 SHA-256: c527c4a013ec3afe5657fe9f5c7346b5e4546d0ee35d1a6a210d9fcd2a559754
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary heuristic firing indicating a link to a known malicious redirector. The document body, though partially corrupted, contains the URL 'https://ttraff.com/pify?keyword=movies++sites+bollywood+and+hollywood', which is also flagged as malicious. The PDF also exhibits characteristics of a link farm, with many links pointing to shopify domains, likely to improve search engine ranking for malicious content.

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/pify?keyword=movies++sites+bollywood+and+hollywood
    • http://files.olasfavourites.com/uploads/1/3/1/6/131607010/rokefilanoxixera.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67062005494.pdf
    • https://cdn.shopify.com/s/files/1/0449/6785/4248/files/design_and_analysis_of_algorithms_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/96976937838.pdf
    • https://cdn.shopify.com/s/files/1/0431/5047/5413/files/73210963366.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/google_adwords_logo_vector.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/29398318739.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/gigesijon.pdf
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/rain_dial_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3192/files/how_do_you_cheat_on_2048.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_off00007816.bin
e1823c32023d53d6f1dad576d21b05fcf86dd6a2fe5bbcee8f3528f3b5c6c4fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x7816 5216 bytes
font_01_sfnt_off000089ed.bin
ac71d998bd26c8e68369bd9d6a1dde2070c098be7741ad9784dd691a5ed939bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x89ED 9996 bytes