Malicious PDF — malware analysis report

Static analysis result for SHA-256 8452b436bfc8f95d…

MALICIOUS

PDF

48.0 KB Created: 2020-08-12 06:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb7110bf3db9dcb313f25310c89f9cae SHA-1: 497558529443534e99efd18434b86d4d0cd47bc2 SHA-256: 8452b436bfc8f95d04ac528ea155b61ea1a19bcb985dc5dd2e3cf15483e38cb7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text suggesting a lure for 'Valquirias paulo coelho pdf gratis' and includes the malicious URL. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content.

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/pify?keyword=valquirias+paulo+coelho+pdf+gratis
    • http://files.ancientpocket.com/uploads/1/3/0/8/130814226/voteg-vunef.pdf
    • http://files.poppyinthewillows.com.au/uploads/1/3/0/8/130813846/vuvawufes_romajejopo_tefifamuriz.pdf
    • http://files.mrwise.org/uploads/1/3/2/7/132740804/vowaxagoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/nirivoparijixurabeline.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/tuwisuxozej.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/weruwaxovoxerinex.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/nanevalowidovunizak.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/array_data_structure_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/45525033883.pdf
    • https://cdn.shopify.com/s/files/1/0439/8150/4670/files/38058754844.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/zefuxu.pdf
    • https://cdn.shopify.com/s/files/1/0447/3815/0549/files/pandoc_html_to_css.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/nomuma.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/nomujedenejatikawaboviz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/49639993928.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_off00007a68.bin
24d66a9e22563d47502a4ad62180e16f64b43beab1b61e191ee44a93972cfa8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A68 5508 bytes
font_01_sfnt_off00008d14.bin
400481e94d3676a8be8fe86ece14498789b3dda542a4705dddd5e43566651f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D14 10976 bytes