Malicious PDF — malware analysis report

Static analysis result for SHA-256 0836c157de434147…

MALICIOUS

PDF

32.7 KB Created: 2020-08-24 23:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f91a1c902309f86726c0b95832a5ee54 SHA-1: d1bb121e5edd41b80343678021318d78b7432da6 SHA-256: 0836c157de43414729fecc5af156f82476132f7005dbab956ea4f976dc30820a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.com/pify?keyword=casadio+dieci+a3+manual', is likely used to obscure the final destination or to track clicks. The document also hosts a large number of other PDFs on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier 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.com/pify?keyword=casadio+dieci+a3+manual
    • http://gaguxamep.fleurspressed.com/uploads/1/3/2/6/132696067/4703236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8398/8125/files/convert_set_to_list_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/60637468839.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/wazepisavobesiludubinode.pdf
    • https://cdn.shopify.com/s/files/1/0432/8190/7870/files/79572213869.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/pabawarizatudaxakiwanasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9766/9278/files/vuvububa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/sosesuwipurafazame.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/corazon_de_nio.pdf
    • https://cdn.shopify.com/s/files/1/0445/6854/3396/files/printable_alphabet_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0432/6994/7555/files/moteraxopedovobunapidera.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000424a.bin
452e9fddec4414f05a5a2b3e199c96b2c2d166e1c3199270af601ac82c88d529
pdf-font-stream PDF embedded font (sfnt) at offset 0x424A 5060 bytes
font_01_sfnt_off00005360.bin
007559b69be0b1ab083d0b0741a25a8f61b4a0a91573d98b6834c58f75666fa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5360 10236 bytes