Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5bc929013d78cb…

MALICIOUS

PDF

43.1 KB Created: 2020-08-14 13:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7dbc84716167a3735ae197fa38e5f00 SHA-1: 4c752abc93bf5e00cc224bdf1fcbf1277e9c3eec SHA-256: fd5bc929013d78cb4d9941bb8b014bbe33fdaad99696c3b8df82593cf90605ae
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL is https://ttraff.cc/wb?keyword=shastar%20naam%20mala%20pdf%20download, which is likely part of a link farm designed to improve search engine ranking for malicious content. The document body, though heavily obfuscated, contains references to PDF downloads and the malicious URL, reinforcing the lure. No scripts were extracted, but the presence of a malicious redirector and link farm strongly suggests a phishing or malware distribution 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.cc/wb?keyword=shastar%20naam%20mala%20pdf%20download
    • http://jarilolef.nossg.org/uploads/1/3/1/1/131163599/8734486.pdf
    • http://files.pop-wuj.org/uploads/1/3/1/4/131453251/jakedojonafawi-xujabu-samozud.pdf
    • http://files.taeyongpark.com/uploads/1/3/0/9/130969012/biwonedutitutilomize.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/balancing_redox_reactions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/5406/9910/files/fractals_in_molecular_biophysics.pdf
    • https://cdn.shopify.com/s/files/1/0440/5713/3221/files/ansel_adams_born_free_and_equal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/41838304410.pdf
    • https://cdn.shopify.com/s/files/1/0439/0980/8280/files/37483218604.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/99529223578.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/dagikodibadavatosoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5795/5494/files/96993289248.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3587/files/bigoluratomipodilinov.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/88927969880.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/1/0432/4042/3587/files/bigoluratomipodi

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dd9.bin
3cd15a7fe998e018a166f754983f438911a8147eeac9cb2483d84c5b3567619b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD9 5476 bytes
font_01_sfnt_off00006053.bin
20bec287f534deb3861c20c542ae8a304dbafe6ebd31f84b0a6518a50b94c1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6053 4132 bytes
font_02_sfnt_off00006fee.bin
b94280c7607a792a9e434c78a21733999f11011ad7501a26e84a08a4be28c714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEE 14652 bytes

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