Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71338235c7ee498…

MALICIOUS

PDF

49.0 KB Created: 2020-08-31 02:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea814517ed313d688318b9d42bc64d39 SHA-1: 88b56cd28d37fcbc63bb330b35ca3311720fc4b9 SHA-256: f71338235c7ee498afe82083ce935880054b895e411ddb1f775ccf65638ebb2a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.cc', which is associated with malicious activity. The document body, though heavily obfuscated, contains text suggesting it is a 'guide book' and includes the malicious URL, indicating a lure for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=total+war+warhammer+guide+book
    • https://static.usrfiles.com/ugd/b4609a_34289878e2d14c3e8f5e9ed75cb79d02.pdf
    • https://static.usrfiles.com/ugd/b8c837_54501e7fd0c8447d87c786dee27e2473.pdf
    • https://static.usrfiles.com/ugd/f1780b_7aeeed2a8dec4f1d87d5a3957b6c983b.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/34335503252.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/descargar_libros_de_motores_electricos_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0441/9478/files/cataphoric_and_anaphoric_reference.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8983/files/loxoxatuguwumup.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/kesunikob.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/35212294460.pdf
    • https://cdn.shopify.com/s/files/1/0432/8135/0820/files/akbarnama_persian.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/32563310382.pdf
    • https://cdn.shopify.com/s/files/1/0460/1688/8999/files/university_of_bristol_postgraduate_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2694/files/tukuzowabebixovefurorub.pdf
    • https://static.usrfiles.com/ugd/8b2c09_a80c8fecabeb464f98823c2e4461a455.pdf
    • https://static.usrfiles.com/ugd/7ff653_f051e277a2f74e76b677841274cdd6db.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_off00008369.bin
599843d4c64e2cf918973f1987b32716da1fb59becdac1e7bee74584e1bdbac7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8369 5308 bytes
font_01_sfnt_off00009559.bin
9041ded4e6d3c676679dd14cbdc1c85954bf6642e30828220f5df5c001ed43ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x9559 9812 bytes