Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bcd3c41aafbba4…

MALICIOUS

PDF

45.5 KB Created: 2020-07-30 11:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4380373d2673dc933ef57e3b6ac9c0 SHA-1: 40dfa9bf331ade9f9181e5095dc27f501a1119b8 SHA-256: 36bcd3c41aafbba4e6db798d72a076fe75d94953c036a2685b6c781973ee1158
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, forming a link farm designed to redirect users to potentially malicious content. One critical heuristic identified a direct link to a known malicious redirector infrastructure at 'ttraff.cc'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure.

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/pify?keyword=anthony+robbins+livros+pdf
    • http://files.nativeamericanfluteshop.com/uploads/1/3/1/8/131857390/9797345.pdf
    • http://files.uno-corp-online.com/uploads/1/3/1/4/131453114/wejowikelokaw_wagavopifisi_konod_xavakotoxulade.pdf
    • http://files.goldeneardigital.com/uploads/1/3/1/4/131438829/2801616.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2099/files/repolepiduxigitavetox.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/22866071728.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/26030915459.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/nufabamowudo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/32516396314.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/xazoki.pdf
    • https://cdn.shopify.com/s/files/1/0434/3395/1399/files/rumujejanaravejuduzamamiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8036/8796/files/xukupagoxenemu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/zimubagezowarufoxig.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/17908070463.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/
    • https://cdn.shopify.com/s/files/1/0431/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a7.bin
9db0e3901db987b4a57b5dfd2af25e963b1a813f36787c0663a76c6e8b571177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A7 2896 bytes
font_01_sfnt_off000073e8.bin
d263053dcb2689a505b91bc88bdce0191fb382e14618d197574cc2b4ba23c605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E8 4880 bytes
font_02_sfnt_off0000846f.bin
b1ee2522d1ed709ff624503571109c14757e5bb8ec57164448696c77ffe1a3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x846F 10560 bytes

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