Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eee9ef95b658082…

MALICIOUS

PDF

37.8 KB Created: 2020-07-17 14:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0a645a3ed3eafc3fdd60e941c7c5e7 SHA-1: 42d0a98a8df21c1de024d7a44fb1eee55df3bd4c SHA-256: 2eee9ef95b658082c1ae1cec9a45c47a8907f138923d12a394dcc926f49d6dd0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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/wb?keyword=cpe%20test%20book%20pdf
    • http://files.bloomflower.net/uploads/1/3/2/7/132712369/nakoxotijexogeruf.pdf
    • http://files.kansas4apowerlifting.com/uploads/1/3/1/0/131070030/3771415.pdf
    • http://files.devitthouse.com/uploads/1/3/0/8/130874451/79cb9298b5.pdf
    • http://files.anchoryourfootprint.com/uploads/1/3/1/6/131636700/nigekibajajunakujet.pdf
    • http://files.anchory
    • https://tokejar.files.wordpress.com/2020/07/vuxovivemovizarobe.pdf
    • https://fukagutezi.files.wordpress.com/2020/07/782466737.pdf
    • https://povodijagez.files.wordpress.com/2020/06/48573688918.pdf
    • https://vabajug.files.wordpress.com/2020/07/48188379000.pdf
    • https://rotapofex.files.wordpress.com/2020/07/dazikumavojuxeti.pdf
    • https://fewabod.files.wordpress.com/2020/07/weratu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/29188175777.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/mazanedemoluvolereni.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/fapitesujotuweludazemun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazutorigixasozesilax.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/surotukorekadoxeviwojupi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1292/2264/files/79263927119.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/mapibijito.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/sebuwiwubevemodit.pdf
    • https://cdn.shopify.com/s/files/1/0429/4941/0979/files/kobetopidowugipa.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_off00005b97.bin
216270e224ef5cce02f536488cf7091ff7f0d4d1b356d39b153d52901231be97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B97 4560 bytes
font_01_sfnt_off00006b20.bin
1d0e6a1fbe14e196daa0740f42e8b6d021cf78d938764053b03a7a0cbc0e9bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B20 9208 bytes

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