Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1719cfe9dcf5b46…

MALICIOUS

PDF

46.0 KB Created: 2020-07-21 11:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c17881e36c358ec149ca4df7c26561 SHA-1: c2d9f9757725e5c409b9a39f97033a1df31d232d SHA-256: f1719cfe9dcf5b46b1f290991a2aefb4a202a2fc6f95a8c06f76f370b4a712ee
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack vector appears to be luring users to malicious sites via embedded links.

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.com/wb?keyword=conamed%20enfermeria%20pdf
    • http://files.peterclarkmd.com/uploads/1/3/1/0/131070979/sinutefe_vikar.pdf
    • http://files.wainfleetskating.ca/uploads/1/3/0/7/130739117/zakimesenamom_fuwegi_bitixijajap_busimirafud.pdf
    • http://files.thebiologistapprentice.com/uploads/1/3/2/6/132695472/domedisurowedilutuv.pdf
    • http://files.wainfleetskating.ca/uploads/1/3/0/7/130739117/zakimese
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49090326843.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/xolejudezijugusakerefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/guwesimutetalajizobanubel.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2687/files/zoromupo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6296/6937/files/zorejenixikexona.pdf
    • https://kemofef.files.wordpress.com/2020/07/xivojedod.pdf
    • https://bekururumema.files.wordpress.com/2020/07/92145235800.pdf
    • https://kejovexa.files.wordpress.com/2020/06/sizunuwajavibiwebatix.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/tosuwipukeginidolejol.pdf
    • https://cdn.shopify.com/s/files/1/0432/8036/7780/files/nakixejokilajuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/81961942419.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/fowevikoguzanadujonipejip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/zezimugozubaj.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_off000074f1.bin
80fb4a5f0377a462562e397f8f468f51dcaf09309b2f14c0fe2f3af5f0977195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F1 4708 bytes
font_01_sfnt_off000084cd.bin
3056d0ca7912b655488c10bbd0005f940f54a57391eecc848693e7d15647b2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CD 11112 bytes

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