Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd531b8a9728e806…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 22:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbb6e006a0862cb7d495e9b418d972ba SHA-1: db9f3be8a55f8d93ace4c9018c3186e8371534b7 SHA-256: bd531b8a9728e806bf9af61d36c230e700f6ff0bb0faa1d9ed4d2dd434490ec8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, reinforcing the attack pattern of link-based redirection. No scripts were extracted from this sample.

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/wix?keyword=super+mario+bros+3+mix+snes+loveroms
    • https://cdn.shopify.com/s/files/1/0432/2715/2539/files/volume_booster_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/colorfy_premium_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5644/files/83858438149.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/vakipafosadak.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/pogedevixeborip.pdf
    • https://static.usrfiles.com/ugd/739437_de8df3c3e8cd4bdeb1d4b1c3efebbef0.pdf
    • https://static.usrfiles.com/ugd/0c41e7_8ae334aaa3874e178e0d5d803ba9c11b.pdf
    • https://static.usrfiles.com/ugd/b8c837_da2e3c21bba248d6850bf709c25cec2c.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_4b5cb51eb7494afe8a36502b3ccd92bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1e84343a25045e0af5817545cbc537a.pdf
    • https://static.usrfiles.com/ugd/b8c837_784ab9ff4f1f49e38983d04f34a910e7.pdf
    • https://static.usrfiles.com/ugd/eed56f_254db07813ed48f0a69c1d1ed0d647e8.pdf
    • https://static.usrfiles.com/ugd/739437_0dc12d4ee1024bda8175f4a2661021ea.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_off00006439.bin
8aa1757a41878b388e3ddc7bc445104d306c9fa6d7e81d54d2f3447180fc3bf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 5500 bytes
font_01_sfnt_off000076d3.bin
83307baf6f824394a8ba46fe267891adc72330a8a5708f93075f41472eb51f52
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D3 10268 bytes