Malicious PDF — malware analysis report

Static analysis result for SHA-256 a131d600d317ebf9…

MALICIOUS

PDF

41.3 KB Created: 2020-08-23 03:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 798e2ca3f071ff34c857d87d2da9ec23 SHA-1: 9ee8d2098d96fe895dc4bec114af13fd0cabd8a7 SHA-256: a131d600d317ebf9bfa81842942223f1c87a9d4f03e7cad4dc4e8964eb2c29a1
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=personification+worksheets+for+3rd+grade', is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'personification worksheets for 3rd grade', indicating a social engineering tactic to encourage link clicks. The presence of numerous external links suggests a link farm or SEO poisoning technique to distribute malicious 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=personification+worksheets+for+3rd+grade
    • http://vezab.stjohnlutherans.org/uploads/1/3/1/4/131413418/pitibu_bamof.pdf
    • http://jeminewa.marburgshowsociety.com.au/uploads/1/3/1/4/131453194/5814180.pdf
    • http://sixeguvok.superdogwalking.com/uploads/1/3/1/1/131163927/1768889.pdf
    • https://cdn.shopify.com/s/files/1/0435/3743/2744/files/wavoxal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6584/files/nalezapefirinokumuta.pdf
    • https://cdn.shopify.com/s/files/1/0429/3879/4147/files/sap_bpc_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/92583728341.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/60772724320.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/48542569565.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/xalepuvibi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/81187972177.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/printable_barbados_passport_forms.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/41974392810.pdf
    • https://cdn.shopify.com/s/files/1/0443/0387/6252/files/dress_code_semi_formal_wedding.pdf
    • https://cdn.shopify.com/s/files/1/0431/7125/0336/files/91762856700.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_off0000624e.bin
24970ef6d8af45ffe2cc38f360831b0bc5f1b9fbf23532bee5a76a9548b545a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 5572 bytes
font_01_sfnt_off00007546.bin
fe0974481a38123c9ce614874e97f85f3d34252cb8f21cdc205570ac61c5ebd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7546 10244 bytes

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