Malicious PDF — malware analysis report

Static analysis result for SHA-256 07027972ff5fc63d…

MALICIOUS

PDF

46.0 KB Created: 2020-07-31 06:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0008f638ba3582124901268b6ff793fb SHA-1: 18c8122668acd136b5e5559100bc669f4dad8475 SHA-256: 07027972ff5fc63dd8fc66809ae3beadae62d98590e7da3573c37be359e918fa
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to direct users to potentially harmful sites, possibly for phishing or to distribute further malware.

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=autonomous+learning+systems+pdf
    • http://files.flyzephyr.com/uploads/1/3/1/3/131398423/zekiru_pidezariviz_segozilafifege_kifutop.pdf
    • http://files.thepeacefulpup.com/uploads/1/3/0/7/130775286/4e6fb9ea0a140a.pdf
    • http://files.dhltaiwanconnects.com/uploads/1/3/1/3/131378953/1699271.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/verasadejuzitusov.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/sabapepodibaruwopanofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/mazogobigebaruxewog.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/gokimibovupirigevipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4366/files/butanorimigi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1851/6637/files/78854612473.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/kibip.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/bowesavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/betakenalox.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/14896516220.pdf
    • https://cdn.shopify.com/s/files/1/0431/3841/6801/files/zowupafimodedunaxof.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/24868391188.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2089/files/5439895486.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/fusolis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007408.bin
890cfe351f6eaf00c9d131d5bd93974be68caae5759e6593957fdaf30bb44836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7408 5332 bytes
font_01_sfnt_off00008617.bin
d590f5648af894845826ca79fa71160185aaf4115bd7cb1052a21ee61a3be2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8617 10900 bytes

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