Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db9efc31c2e934c…

MALICIOUS

PDF

73.6 KB Created: 2020-07-30 16:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1caa72f27a0cd6ce461c28fb31cdc8db SHA-1: b0fdd39ef16e615be6fc67b19f4ce6abec6218ca SHA-256: 9db9efc31c2e934caea02224b45b9d946d8b76dc08c10724ce5f8d96ae1dcca2
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. Another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to funnel users to further malicious sites.

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=gastrointestinal+system+function+pdf
    • http://files.feiersteinproperties.com/uploads/1/3/1/1/131164046/lozatadusojurukeve.pdf
    • http://files.arenalrainforestproperties.com/uploads/1/3/2/6/132695321/3954436.pdf
    • http://files.eljardinometepe.com/uploads/1/3/1/1/131164479/6325507.pdf
    • http://files.dkarbor.com/uploads/1/3/0/8/130814280/jikijefozonoj.pdf
    • http://files.accomplishedteachingny.org/uploads/1/3/0/7/130775668/c5b2bec2f718f.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/5559423822.pdf
    • https://cdn.shopify.com/s/files/1/0435/8239/0435/files/90742611878.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/zegowekibojaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/dagefudojixuxonorederuko.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/junakolabepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/kefivekuzuzawejurita.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/pifazavexux.pdf
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/76250500518.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8522/files/57162186020.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/64458506154.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/kirotasuruvizolofabin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zotogobujadafozafinuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5074/5512/files/7545217888.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.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_off0000e262.bin
cb0672da98f69c8b587eefdc8ab00be7b9dd6612ebe9e41343e2eaa4d5300371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 5316 bytes
font_01_sfnt_off0000f466.bin
c349db83712a2f8e8166918fc7bbed9b833fd7e05ed9f81dd722e73bf1ca5c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 10544 bytes

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