Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d68fddb99e6d5f8…

MALICIOUS

PDF

36.9 KB Created: 2020-08-12 19:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b561e235aabb265ad41669b1bab0a532 SHA-1: 86c772e53398f030e0b577fea5f488abea9a1e0a SHA-256: 6d68fddb99e6d5f87cceb4c0c4202cd7b49572c60cfbddc3180c484aeb9b3cf4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host other PDFs. One prominent link, 'https://ttraff.cc/pify?keyword=linear+algebra+herstein+pdf', is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. 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.cc/pify?keyword=linear+algebra+herstein+pdf
    • http://files.srinagarhotel.net/uploads/1/3/1/4/131483275/nediwoterobaxukizak.pdf
    • http://files.thedimensionart.com/uploads/1/3/1/3/131379999/77520b640.pdf
    • http://files.mindstatepsychology.com.au/uploads/1/3/1/1/131164081/todatobakowivazub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/8404538196.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/37749094534.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9078/files/florida_state_football_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/sedudexevewivogel.pdf
    • https://cdn.shopify.com/s/files/1/0440/7571/2664/files/xonuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/12328976030.pdf
    • https://cdn.shopify.com/s/files/1/0432/3003/6123/files/autocad_to_dwg_converter_crack.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/narelawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/supudesogixisuko.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/mabodokarunofubibuke.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/mukazotomoda.pdf
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/bokizinuruximekipat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/advantages_of_public_private_partnership.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046d1.bin
2af0d2bd4c8ee51c3cc3140e7511c5da4d4bc022c3e54aad36afe820a8b8107d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46D1 3932 bytes
font_01_sfnt_off00005488.bin
ec6f6493b163790c20d9e6fecaf37fd98efb82f5087117afea33e1a9932ee89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5488 5384 bytes
font_02_sfnt_off000066c0.bin
277c58dbbdf6e6c311c99fa0298b7564e4101014188f5ad713f3bd76d833c67e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C0 9312 bytes

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