Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f836e2eb74c135b…

MALICIOUS

PDF

44.6 KB Created: 2020-08-29 08:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdfad703a734a6a82f825aaf172e25f9 SHA-1: 5672379718a2cb7e37a68ee3aeb4530aacdca89b SHA-256: 5f836e2eb74c135bcb30e6f100caedd5e6fca2b72319056d00249d82e47f6139
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, a common tactic for phishing or SEO spam. One of the embedded URLs, https://ttraff.ru/wix?keyword=west+virginia+radio+corporation, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious content. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or malicious redirection attempt.

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=west+virginia+radio+corporation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/pro_forma_adjusted_ebitda_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/1793620304.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/la_cimbali_s20_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/84704534285.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/ffbe_maxwell_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/76172362285.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/gesibemogakaxab.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/lr_androids_hidden_potential_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/76602743212.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8770/files/72648069192.pdf
    • https://cdn.shopify.com/s/files/1/0437/5438/9665/files/75236521855.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/2170738650.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d9d6dc979fe4e8493946f2e5b0cc57e.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbf61614925c45b59beeea5a0c209236.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ff460a1e14c4c8c9458a8e6829bc181.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ea90ecca954ddb8538d840114365d5.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_off00006f84.bin
7a39636d09be33a2ec7ae19f1e9de5e3954da3ad6c5ddf3afe4d77e3c6cc4bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F84 5284 bytes
font_01_sfnt_off00008197.bin
bcc3f08082454a23ff6c8db27837ba8f7a308811204ded55ec2d8d246e8793cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8197 10492 bytes

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