Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0afb07977361c1e…

MALICIOUS

PDF

34.4 KB Created: 2020-08-29 23:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d761108dbe2d04b29b72c0d894cb518 SHA-1: ea666ff9f038941ace602599f710006b6ef13934 SHA-256: f0afb07977361c1efc10127254fbc3f6d2b30e76e09346b6ec47b74aed4c1aae
152 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary malicious link, https://ttraff.ru/wix?keyword=handwriting+sheets+ks2+year+3, is identified as a redirector. The document body, though heavily obfuscated, contains keywords related to educational materials, suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=handwriting+sheets+ks2+year+3
    • https://cdn.shopify.com/s/files/1/0439/3045/2123/files/gewimudofokoburerup.pdf
    • https://cdn.shopify.com/s/files/1/0437/5412/7521/files/helix_piercing_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20136550696.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2634/files/21232823814.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/noise_risk_assessment_report.pdf
    • https://cdn.shopify.com/s/files/1/0472/2599/5429/files/gisebetijosazufajot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/46831045634.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/pekodedexorilovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/paruxamesixopovus.pdf
    • https://static.usrfiles.com/ugd/b8c837_71abadd34b074b6fbf1a82c59012821b.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb184881cb31407da45e654eb608e234.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb993aec78354c05bc22b84878ffdd64.pdf
    • https://static.usrfiles.com/ugd/2b25b5_d90ac7b8cdc845f49d7bd3de08f2dfef.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_off000049a8.bin
ce28c4429dbbb456f8796d2f67b2ec6831193b254dddfaedbbc0e819a7acddb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x49A8 5568 bytes
font_01_sfnt_off00005ca6.bin
cd8ca2cc1efca9ac2479afd0cd09cf3edf1d603ff8de121b25f2ab2d84ff57c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 9556 bytes