Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c2bbd1eb95923e…

MALICIOUS

PDF

44.9 KB Created: 2020-08-29 05:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92d5f53a5d45fead57dc16c0713cd30f SHA-1: 392c387289191f14a8b1cb26cd8b118c841d1874 SHA-256: 71c2bbd1eb95923e4cd49a9774f6a6e1e6fa2a55402734ee5bd6545d6192f3a5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as a download button, aiming to trick users into clicking it. The ML classifier strongly indicates maliciousness, and the link points to known malicious infrastructure. While no scripts were extracted, the presence of a malicious link and the document's structure suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=angry+birds+2+cheats
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/pai_nosso_em_aramaico.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/minions_beatbox_ringtone_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/asuransi_kesehatan_swasta.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/votufonoxosewixudomogiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/21318697953.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/25258806118.pdf
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/95836515228.pdf
    • https://cdn.shopify.com/s/files/1/0457/4652/0220/files/16136231438.pdf
    • https://cdn.shopify.com/s/files/1/0431/0545/2193/files/1292298294.pdf
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/android_studio_example_project.pdf
    • https://static.usrfiles.com/ugd/b8c837_f09e7c95316f4fa48aca75a811768719.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cfa5597007e4f47b2f3430a40f4883f.pdf
    • https://static.usrfiles.com/ugd/b8c837_90f3194e6bc64949924889cee6bf18be.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6e50d7eec554b30a4c237b99f2aed9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_294104df70344baf87e2347009221771.pdf
    • https://static.usrfiles.com/ugd/b8c837_694db9700031449888a3771616668c3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ea90ecca954ddb8538d840114365d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a51c60f2af9e41fd9d725dd92c7091cb.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_off000070ed.bin
39752f7ab660a8694416c9ce72746f807365661ac6abd9acf100563b6e1d178c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70ED 5532 bytes
font_01_sfnt_off000083af.bin
aa753ded49ca91ea1ffebd78af6fbebb05b3041b9721a730c36b81de933e4050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83AF 10176 bytes

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