Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc4886dd9908ad9…

MALICIOUS

PDF

41.8 KB Created: 2020-08-16 15:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77c49ce8f8c96dbf1b90d7eda75e79c0 SHA-1: dd5e5fe87fa955906816c12b64dc3ee3d4277a07 SHA-256: 3dc4886dd9908ad9e960d9d91664e242a9ec146c89bc2a76014ed6beeec04544
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to 'polynomial synthetic division worksheet with answers' and includes the malicious URL. This suggests a social engineering lure to drive traffic to malicious infrastructure, likely for further exploitation or malware delivery. The presence of a malicious redirector URL and a mass of external links points to a link farm or SEO poisoning attack.

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.com/pify?keyword=polynomial+synthetic+division+worksheet+with+answers
    • http://vuradasab.creeksidekennelsgsd.com/uploads/1/3/1/4/131437914/9d030598a4c.pdf
    • http://files.pianoreflection.com/uploads/1/3/1/3/131379971/29e8aa5dbd52.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/fajatumalezepogufigelu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/1827534973.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/59608826910.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/fulomonefagof.pdf
    • https://cdn.shopify.com/s/files/1/0429/2083/7279/files/learn_english_alphabet_writing.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/6763400636.pdf
    • https://cdn.shopify.com/s/files/1/0429/1595/4855/files/2366476369.pdf
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/bitevinonugonemiperi.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_off0000590d.bin
5bfc2b3299cb3b3a71588feb76d85ac67832738911625e45a956166e6fda3ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x590D 5288 bytes
font_01_sfnt_off00006ada.bin
894e06931633f91c0c9e066bda89f38911041e6f9b0d12759ac01e38fc73c36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADA 9804 bytes
font_02_sfnt_off00008c55.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C55 4324 bytes

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