Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e22acb6c60edba…

MALICIOUS

PDF

54.5 KB Created: 2020-08-23 04:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aea83f0458df9b1f713c0f2785ed42ed SHA-1: 53482e10dac0ebef7df18262a7aefbf1b03d9496 SHA-256: 28e22acb6c60edba12a989a7427dddf655aea23aa6e8ca3950b0db82b543734f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=mappa+turistica+di+bologna+pdf', which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and references to 'wkhtmltopdf', indicating it was likely generated programmatically to appear as a legitimate document while serving malicious links.

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.cc/pify?keyword=mappa+turistica+di+bologna+pdf
    • http://julafaram.crfgoldens.com/uploads/1/3/0/9/130969959/7041182.pdf
    • http://files.jamesballardmusic.com/uploads/1/3/1/3/131381376/3781536.pdf
    • http://files.atvguardshop.com/uploads/1/3/1/4/131407148/477cdc4f3eac96.pdf
    • http://rusokofed.playbettergolfacademy.com/uploads/1/3/1/4/131406893/xosidolix-fakoduzu-temabutazewo.pdf
    • http://files.abarthdrivingschool.co.uk/uploads/1/3/0/8/130814466/3395625.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8291/files/vovegimuvebov.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/80743321563.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/cub_loboy_154.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/javascript_tutorial_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/xazuginixivizugo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/jhumka_gira_ray.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8170/files/93707082614.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/alpha_color_codes.pdf
    • https://cdn.shopify.com/s/files/1/0436/9815/9769/files/bosofav.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/barojogis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/biosurfactant_producing_bacteria.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dc9.bin
2b69c52509aba4881240e8a191291645f85643b8aa49114020e804fba1aa9de9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC9 5468 bytes
font_01_sfnt_off00009065.bin
e7e26241d8570ad517a1b9bdadfbfa1330c0b47bfcce50c1059aface7772353b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9065 11872 bytes
font_02_sfnt_off0000b73c.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
pdf-font-stream PDF embedded font (sfnt) at offset 0xB73C 16312 bytes