Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecb7de9f0969b6b…

MALICIOUS

PDF

34.4 KB Created: 2020-09-03 02:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a40e00d3cae709b124f5400100ad712 SHA-1: 6e84c1e379c1b13140dd28b2c2d60372f08ffde2 SHA-256: 4ecb7de9f0969b6b863f57044e6b8a6d495247a62308a5931de898ff1c9cc796
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=gunpowder+plot+worksheet+ks3'. The document body and heuristics indicate a link farm strategy, presenting itself as educational material ('gunpowder plot worksheet ks3') to entice clicks. While many linked Shopify URLs are benign, the presence of the malicious redirector and the sheer volume of links suggest a campaign to drive traffic to potentially malicious destinations.

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=gunpowder+plot+worksheet+ks3
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bekikelazipilexujewa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/rajitizegok.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/wakomatanurokakipejebubo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3404/9703/files/wezarakabidifujagudijij.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/certificate_of_participation_template_word_doc.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/79056374723.pdf
    • https://cdn.shopify.com/s/files/1/0436/1843/5229/files/vx7_commander_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/nalatelemovetat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/refem.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/22666711843.pdf
    • https://cdn.shopify.com/s/files/1/0435/9975/7474/files/concrete_nouns_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0469/2698/7419/files/13642507376.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6408/files/79048329934.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_off000046d4.bin
922e5d9f2700414847e1c1f83458009639e8216291fb56b6b34b7322cf881aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x46D4 5188 bytes
font_01_sfnt_off00005892.bin
03ea0bf798b43a69cbee4e3bf642d71fc7265f547a8c4e8b87d6b3c9bca4b3d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5892 10144 bytes