Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fb50000ddc4c9c…

MALICIOUS

PDF

48.6 KB Created: 2020-08-30 16:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35cf78fa0f1ee367b24c9386e37ef87d SHA-1: 98d6f49a78dc2de7d0658c01042b4db4e24bfc3d SHA-256: 29fb50000ddc4c9c2b18abd3a335bf31dcdf8655125b4008b2719940c209961e
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting a lure to a malicious site.

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/wix?keyword=kingdom+rush+frontiers+walkthrough
    • https://static.usrfiles.co
    • https://static.usrfiles.com/ugd/b8c837_2144100e9be34a09ba9a82ea531e3fca.pdf
    • https://static.usrfiles.com/ugd/8127dd_eb9a8ebcfa73409ebc88d679613eb3b8.pdf
    • https://static.usrfiles.com/ugd/74a852_27390f7ac3dd4887b5c1ce03ecc36014.pdf
    • https://static.usrfiles.com/ugd/122077_4a2e0d6f6a7143b7a36378ffd3dc6502.pdf
    • https://static.usrfiles.com/ugd/34ec99_bd695cdd38fc4ee9a89d228ad35440f4.pdf
    • https://static.usrfiles.com/ugd/eb6612_4194cbe85ac541fbb237e84152d834c5.pdf
    • https://static.usrfiles.com/ugd/d5d855_400f838bf7284709b69588e67c27575f.pdf
    • https://static.usrfiles.com/ugd/b8c837_557249ec494e4881a9f2d85c22145eb4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nofalefupipalivudekim.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8359/files/manuleburerabine.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/56754106738.pdf
    • https://static.usrfiles.com/ugd/a4d998_b7ec17b22c4a408a9c9c00bb860c2a34.pdf
    • https://static.usrfiles.com/ugd/33a16d_31f7348275494334b9e7c3eee38984ce.pdf
    • https://static.usrfiles.com/ugd/accd1f_c574e2bbfa31403aaec5d02175589a25.pdf
    • https://static.usrfiles.com/ugd/b8c837_51de7105e05e4e798e6da468956b3eb4.pdf
    • https://static.usrfiles.com/ugd/bae363_c4001738259a4bedb16238d6c5731579.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_off00007ea5.bin
a2887e44761c7ae20a568c10908377d1c2b76a39735e75f2c1bc4c224fbdd4bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA5 5444 bytes
font_01_sfnt_off00009108.bin
4e4e4745db4623ed9a18e679c49b370593a4a844dae335bb04aeb768ca62826c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9108 10540 bytes