Malicious PDF — malware analysis report

Static analysis result for SHA-256 0382933bfbdd0f99…

MALICIOUS

PDF

43.4 KB Created: 2020-08-03 14:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76ff8f0d30a61771a8fa3f26d8c9308 SHA-1: 9a1ca849702eae6da344ab8bef565545924db249 SHA-256: 0382933bfbdd0f99cd73086ddebe52001a1ca4b9814842b7791d324f69f6e122
154 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its inclusion of a link to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains text related to an 'equity research analyst job description' and numerous embedded URLs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF, indicating a high probability of malicious intent, likely to redirect users to malicious content or phishing sites.

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/pify?keyword=equity+research+analyst+job+description+pdf
    • http://files.dqnv.org/uploads/1/3/1/6/131606367/699701.pdf
    • http://files.lindsaylibenwellness.com/uploads/1/3/0/8/130814043/pigomifewu.pdf
    • http://files.uwualocal423.org/uploads/1/3/1/4/131406372/b203610bfd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1084/1000/files/xikakemenasakijiperaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/potijelim.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/65785165470.pdf
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/58256964561.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2088/files/33005470558.pdf
    • https://cdn.shopify.com/s/files/1/0431/2855/3634/files/salajugikavafelewejojuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3925/files/53459947634.pdf
    • https://cdn.shopify.com/s/files/1/0435/7000/4126/files/lorixogar.pdf
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/77988112651.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9602/files/5169808763.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/litakomofaliwugelabe.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_off0000639a.bin
b06b246051c94f54caa609d0ac6b686e1fdb67fb7e825fce56064a8d83fcf04e
pdf-font-stream PDF embedded font (sfnt) at offset 0x639A 5644 bytes
font_01_sfnt_off000076d7.bin
6cdf2f600814c5a640c2a748c79222500367c99e37ee4a46f8a06a58fd80e4b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D7 13160 bytes