Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd777875addb1064…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 08:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05dda97f20dae67eb4ffc59f7a468af7 SHA-1: 48dd8fce9edc9ff5ac4d38f7b0f31dd5c7c20e7e SHA-256: bd777875addb1064fee7cdf2b43390a95e82c02fd232964db63cdbb8a969abae
150 Risk Score

Malware Insights

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

The PDF contains a prominent link to a known malicious redirector, disguised as a guide for writing a scholarship motivation letter. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The PDF structure and embedded links are indicative of a phishing or scam attempt designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=how+to+write+a+motivation+letter+to+get+a+scholarship
    • https://cdn.shopify.com/s/files/1/0431/0627/1394/files/le_bourgeois_gentilhomme.pdf
    • https://cdn.shopify.com/s/files/1/0433/3820/3290/files/45734438930.pdf
    • https://cdn.shopify.com/s/files/1/0432/3501/6863/files/72915014710.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/16732071401.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/imperative_form_worksheet.pdf
    • https://static.usrfiles.com/ugd/299074_b791e08644bc47b7a63a7ccb62ae635e.pdf
    • https://static.usrfiles.com/ugd/c12414_bfbf99a4624e4cb0a4139890cbc45fb7.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3079/files/39445440936.pdf
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/rimepali.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/konafosebepavaluxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/13644340604.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/7485291735.pdf
    • https://cdn.shopify.com/s/files/1/0458/5996/3033/files/bitozusojikunux.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/95043506784.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/maraxap.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_off0000642a.bin
af902da4376d42197ecd8e1f96167af39b8000e3cc5a5a1c50538bfd98b18078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642A 5460 bytes
font_01_sfnt_off000076a6.bin
96440680bcba812042ae7a50716176c0afed258619591ded8104ba9de6a05a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A6 10592 bytes

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