Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f17a83bc1dfd6b…

MALICIOUS

PDF

44.9 KB Created: 2020-08-03 09:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88f3a6fd1ffa298c2c5bab7a8f4e7608 SHA-1: 753270846e6169e88b427093cdbdea9c2ddbbf35 SHA-256: 52f17a83bc1dfd6b334cbc06aa9f8dc9e3883205acb6db6100c6d5f1e62288cb
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) that is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'install npm mac', suggesting a lure to trick users into clicking the malicious links. The presence of a link farm heuristic further supports the malicious intent of distributing links to potentially harmful content.

Heuristics 3

  • 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.
  • 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=install+npm+mac
    • http://files.sobrightandbeautiful.net/uploads/1/3/1/6/131606003/weduse-wimagisevu-wimegemaj.pdf
    • http://files.coldcomfortswhistler.com/uploads/1/3/1/6/131606687/755e77886309.pdf
    • http://tagavo.aplusacademic.net/uploads/1/3/1/4/131408970/8420597.pdf
    • http://files.bathbombspetersburg.com/uploads/1/3/1/0/131069886/143379.pdf
    • http://files.syntheticgrassonline.com.au/uploads/1/3/1/1/131163898/f1978459a3ff.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/zonuzobulopanitudojet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0669/files/53744288109.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/69276499004.pdf
    • https://cdn.shopify.com/s/files/1/0440/6679/9766/files/zalagiriponufakimuzuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/kekerovunifesufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9095/1848/files/the_pmp_exam_andy_crowe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/36822014027.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/what_is_reactivity.pdf
    • https://cdn.shopify.com/s/files/1/0431/9045/2387/files/72310093920.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/shining_stars_preschool.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/polomozexe.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_off00006a87.bin
5d197658f36d78c9ac2508c0ea73ff2aa2cc28166f3a2c5641fa372b94802f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A87 4920 bytes
font_01_sfnt_off00007b37.bin
9cbbccc2d8fb2bfade7786ce444e2f9a00d8bc9d6030ab85409b4f8d0ab4c68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B37 13840 bytes

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