Malicious PDF — malware analysis report

Static analysis result for SHA-256 073a4995e145504c…

MALICIOUS

PDF

45.7 KB Created: 2020-08-07 15:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3f2e473d56e2ed1c99b0697707fdf3d SHA-1: 1656cecfa3f7afc05258e0707f69ab84fb24531a SHA-256: 073a4995e145504c04ad6dde250d500de1da31358339311da76db9442a77c68c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.ru/pify?keyword=mathematics+in+the+modern+world+lessons+pdf`, which is likely intended to lead the user to malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=mathematics+in+the+modern+world+lessons+pdf
    • http://files.themovementdancestudio.net/uploads/1/3/1/3/131380558/7249882.pdf
    • http://files.goughsrangeolives.com/uploads/1/3/1/8/131857970/mexesin_nefef.pdf
    • http://files.craftedcasesnc.com/uploads/1/3/1/4/131453252/78ef3c11ab1da7.pdf
    • http://files.ninebotours.com/uploads/1/3/1/8/131856012/tulusema-xadewu-revog.pdf
    • http://files.harvestofsongs.com/uploads/1/3/1/4/131483391/tofulanobuviza-tibarazeka-sovotez-xuraxiduvunis.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4504/3876/files/fimenesarudi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9421/files/xanopusexigusavilakiritox.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/wezibonizazarujikarujig.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/98203224086.pdf
    • https://cdn.shopify.com/s/files/1/0429/4528/2214/files/befugotekakajigok.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/sbi_bank_po_preparation_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/94617468625.pdf
    • https://cdn.shopify.com/s/files/1/0434/3539/3180/files/kerugekobujisorexipo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/99894233390.pdf
    • https://cdn.shopify.com/s/files/1/0428/0506/7943/files/56241741129.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd1.bin
a90f79d35b855d6e419c922e1c16a7f20c875ed03b3e5f8d6d8c2638309ac592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 1604 bytes
font_01_sfnt_off000074f4.bin
83d44bab7b5d71f0f9dd3a6d774a93267d7d989f13895cf0e70e605c2f3b0b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F4 5492 bytes
font_02_sfnt_off00008795.bin
053e4bc0a4e5806a49e6fb7688d6acfaf7b88236929a9dd28c2f96309853ad3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 9960 bytes

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