Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb9dc730802166e…

MALICIOUS

PDF

51.6 KB Created: 2020-08-03 23:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05f3000436188e2de2f1e61c7f8235e SHA-1: c2cd297ab939003f72aaff211b0269899bdf2157 SHA-256: cfb9dc730802166edb26a97b49184eb313cea10f2b8c68aa6f9c1074a7d86db3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=advanced+vocabulary+words+list+pdf'. This link is embedded within the document body, suggesting a social engineering attempt to trick the user into visiting a malicious site. The presence of a large number of external PDF links, many hosted on shopify.com, further indicates a link farm or SEO poisoning tactic to distribute malicious content.

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/pify?keyword=advanced+vocabulary+words+list+pdf
    • http://files.rigirozziarts.com/uploads/1/3/1/6/131606569/gadakesibowad_zipawanejaxa.pdf
    • http://files.azguide.net/uploads/1/3/1/0/131071073/6f0349846dd9c1.pdf
    • http://files.goodhealthforgoodworks.org/uploads/1/3/1/8/131872269/8299665.pdf
    • http://xosonawa.simondeacon.com/uploads/1/3/1/4/131407155/luvovotosuminexabo.pdf
    • http://files.northelkinchurch.org/uploads/1/3/1/4/131453902/tefojuzubisir_debati_ritakurigiboket_fazafavipori.pdf
    • http://xosonawa.simondeacon.com/uploads/1/3/1/
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/52657118334.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/11763899080.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/66184555894.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/lokufudejubuzujufowefek.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/tasakigixase.pdf
    • https://cdn.shopify.com/s/files/1/0437/6454/7741/files/pefatab.pdf
    • https://cdn.shopify.com/s/files/1/0440/4445/2005/files/best_pvp_class_6._2.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4567/files/12923440409.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/taputunefuweb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/21970029662.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/kopigubenowetoginulatod.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_off00008c02.bin
76b5135ea7698a6d3b08ba7ac787e5419affb81de1fd77290a7db85cb0433dcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C02 5532 bytes
font_01_sfnt_off00009efc.bin
34533621d61a6cae03e55e00a8ab990589568bfe71649c8322fcf36d00f826ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFC 10088 bytes

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