Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da062550093e29a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-18 16:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6838fa2df05503667d70cfd561bee48 SHA-1: d958e65657b3149e55e483cb6803c4bfffb09184 SHA-256: 8da062550093e29afbd0d2bc6551faa2fe665a1dd50c4ed6a9cd191446bf65ae
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though partially corrupted, contains the URL 'https://ttraff.ru/pify?keyword=complex+sentence+pdf+worksheet' which is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=complex+sentence+pdf+worksheet
    • http://soburaja.jodynixmusic.com/uploads/1/3/0/8/130814995/8857830.pdf
    • http://files.animaliadiertraining.net/uploads/1/3/1/1/131164476/8666987.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/lelevozo.pdf
    • https://cdn.shopify.com/s/files/1/0441/0041/9736/files/83475424921.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/duzixebepa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/national_building_information_modeling_standard.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1781/files/sextus_empiricus_adversus_mathematicos.pdf
    • https://cdn.shopify.com/s/files/1/0437/3459/7784/files/file_jadi_satu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/61539729137.pdf
    • https://cdn.shopify.com/s/files/1/0431/6545/0391/files/73825264850.pdf
    • https://cdn.shopify.com/s/files/1/0431/4346/3074/files/tuxuduxuzelajuzisoko.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/amanaka_sita_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/4018/6279/files/3074147065.pdf
    • https://cdn.shopify.com/s/files/1/0437/5327/5546/files/11766369245.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_off00006947.bin
ac75d730057393b06a131c3f12f86be714447a361f544255be98e70e6452d45f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 5312 bytes
font_01_sfnt_off00007b4e.bin
0574caa753cb06d08cb22dcd3a4668bb24e897f12090776844633b15549128c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4E 10176 bytes

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