Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aa7835800adcb1…

MALICIOUS

PDF

37.2 KB Created: 2020-08-26 23:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0c6c45e3e474b47805e95d5a5dc7f9 SHA-1: bb553dca9f289c5987d7c506d7cb45a0408ceb81 SHA-256: 87aa7835800adcb162e39f4bf73dbf6ef2c638e70e49a6c54079783c6d41f0c1
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with heuristics indicating it's a link farm designed for SEO manipulation. One of these links, 'https://ttraff.me/pify?keyword=queen+another+one+bites+the+dust+gui', is identified as a malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious activity appears to be the distribution of links.

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.me/pify?keyword=queen+another+one+bites+the+dust+gui
    • http://bapobo.spiralingheartskidsyoga.com/uploads/1/3/0/7/130739173/vopetogorojum_roxoxik.pdf
    • https://cdn.shopify.com/s/files/1/0428/4317/7126/files/burodalizegoki.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/60935069302.pdf
    • https://cdn.shopify.com/s/files/1/0432/1706/0007/files/bandos_solo_osrs_guide.pdf
    • https://cdn.shopify.com/s/files/1/0447/0882/3193/files/bosch_plena_mixer_amplifier.pdf
    • https://cdn.shopify.com/s/files/1/0432/3734/3387/files/d_d_3rd_edition_books.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/37003763118.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/farmacos_analgesicos_opiaceos.pdf
    • https://cdn.shopify.com/s/files/1/0438/0806/3649/files/lion_headband_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/luxenetomelirif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/japanese_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/79956007866.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_off00004d7e.bin
2b1cca3388fd9ff97013c3c7a44494cb1b9d0495870b1092f131261ace3d8cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D7E 5256 bytes
font_01_sfnt_off00005f4a.bin
64a6dafc31dbc6d71d7e251a4ab4fa93ff729a1355c6c5b556db9ef0021bd3d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4A 12804 bytes