Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa788585b7e4070f…

MALICIOUS

PDF

41.5 KB Created: 2020-08-05 04:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 724613a55a8418c450aee4ec522cc852 SHA-1: 618b440e4ba215293986a1c588ae4077c69592fc SHA-256: fa788585b7e4070f62ee9f4b08a7a38af3245b20092ea73d83b3d3ec012cc8aa
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. The primary redirector link, https://ttraff.ru/pify?keyword=carbohydrates+worksheet+pdf+answers, is flagged as malicious. The document body, though heavily obfuscated, contains text related to "carbohydrates worksheet pdf answers" and the authoring application "wkhtmltopdf", suggesting a lure to disguise the malicious links. The presence of numerous Shopify links, while some are benign, contributes to a link farm strategy.

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.ru/pify?keyword=carbohydrates+worksheet+pdf+answers
    • http://files.burstingbarnsministries.com/uploads/1/3/2/7/132712214/fifomesugob.pdf
    • http://files.coldwatercreekranch.com/uploads/1/3/1/4/131409309/3908049.pdf
    • http://files.delloewenthalphotography.com/uploads/1/3/1/4/131437806/6574307.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/felinegapokasekixug.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/86813659155.pdf
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/kosavij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9017/files/gevuxemapiwovi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/soxakejigizafaxemevexoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/formatar_s3_mini.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/pekorerize.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/nuladojoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lamafavikunidamekisuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/34674450110.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/pain_train_tf2.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/sasivixalekuzol.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_off000063ff.bin
61836e15b7182a3a954cb70c61ee817511fa68f9d38b3b25f9a212e4cc304849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 5400 bytes
font_01_sfnt_off00007664.bin
f5da432ff243df89423013fce64bd0c894a9756ce110d10eef74ecbb26129189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7664 10144 bytes

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