Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37b63daeaa6d462…

MALICIOUS

PDF

46.9 KB Created: 2020-08-08 12:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0cec62788de599068b55a7d817a76d SHA-1: 956dae610460090c4e2731b536a92c929f09dc64 SHA-256: c37b63daeaa6d4627d0eb00270b1acde796d39fca3bb1568410563c76d80a31e
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, which is disguised as a search result for 'Altera quartus ii manual'. The document also features a large number of links to other PDFs hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.com/wb?keyword=altera%20quartus%20ii%20manual
    • http://taterox.rana-tarabishi.com/uploads/1/3/1/4/131453870/fekojexorew.pdf
    • http://files.jacydraws.com/uploads/1/3/1/4/131438025/eba81bfd409.pdf
    • http://files.hinisha.com/uploads/1/3/0/7/130775245/kejafurilovew_punaveti.pdf
    • http://zoveze.davidggrade3.com/uploads/1/3/1/8/131857334/2920061.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/67250256187.pdf
    • https://cdn.shopify.com/s/files/1/0430/7566/6073/files/nawonatuja.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1300/files/nulinefifuxuwilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/devi_atharvashirsha_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/43563660642.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/php_reverse_shell_one_liner.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/72256938253.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38743570217.pdf
    • https://cdn.shopify.com/s/files/1/0432/4209/4755/files/download_tink_bonnie_and_clyde.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/wurutavajepevugasox.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/dorifomalus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c53.bin
b24c93c62112afa823be1061ef26ab4d490e9b700d00c977b65115c4b03e87fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C53 4720 bytes
font_01_sfnt_off00007c32.bin
64419c53d27893f832ef9488cb8309c54176633b045d3ee9212f0df79020603b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C32 10668 bytes
font_02_sfnt_off0000a0ac.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0AC 4324 bytes

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