Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90e63c42d2336bd…

MALICIOUS

PDF

40.5 KB Created: 2020-08-15 05:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a36a295509468a03ce9d410d4b6d9cc4 SHA-1: 52c1b2ee9fd5546708d04d264ad9004b45b4207c SHA-256: d90e63c42d2336bdf3ec57b0caaa1badbad0d62cc101c92422c0fc4eca571360
150 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', which is likely the primary malicious payload delivery mechanism. The document body, though partially corrupted, contains text related to 'new headway elementary 4th edition student book pdf', indicating a lure to attract users searching for such content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wb?keyword=new%20headway%20elementary%204th%20edition%20student%20book%20pdf
    • http://files.hannahrmorrison.com/uploads/1/3/1/6/131606674/58316.pdf
    • http://files.southcreekcandleco.shop/uploads/1/3/1/4/131437702/sasiwevolijunokixoj.pdf
    • http://files.brittbuirs.com/uploads/1/3/1/4/131454352/xajomufubijo.pdf
    • http://files.prigitalsolutions.com/uploads/1/3/1/0/131071076/577897.pdf
    • https://cdn.shopify.com/s/files/1/0429/0769/7305/files/lemanugugirijugibezasafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/susenafiwitupubimamuko.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/xenuwolejilurivovetalux.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/biochemistry_basics_pogil_extension_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/tidivepubokikup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9924/3174/files/nivabinaned.pdf
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/skulduggery_pleasant.pdf
    • https://cdn.shopify.com/s/files/1/0432/6119/8500/files/22812610122.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3501/files/judoveta.pdf
    • https://cdn.shopify.com/s/files/1/0432/1620/8036/files/74963415723.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/davunaxejapezuxipuwuwozom.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/81835702888.pdf
    • https://cdn.shopify.com/s/files/1/0431/0492/7905/files/85125194517.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/javascript_games_codes.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_off00004fde.bin
bbfc7e740e08216efbf6b0ca286ebb524df0613ffabc87389125925962de6afc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FDE 5736 bytes
font_01_sfnt_off0000635e.bin
41dd23762b37f33f43dcbcf6536bd012cedc9abab1a487f24c0390a18de983ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x635E 21288 bytes