Malicious PDF — malware analysis report

Static analysis result for SHA-256 673bd47cb7085a68…

MALICIOUS

PDF

47.8 KB Created: 2020-08-25 07:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2f9257e247ae8c36cdd2b4d3c04d6db SHA-1: 01067dc4226d67442d5b5e870ce6f1b0becf89c3 SHA-256: 673bd47cb7085a687f361241433180d968ca570f7d84e5070286a5f3a136c083
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The presence of a download button lure further supports a malicious intent to trick users into clicking through to a harmful destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=certificate+of+appreciation+army+form
    • http://tejut.claphands.net/uploads/1/3/2/8/132816066/4175395.pdf
    • http://files.beaverlakehaven.com/uploads/1/3/1/3/131379406/2616360.pdf
    • http://fumumila.runsquadopo.org/uploads/1/3/0/8/130873951/nokoxako_sefawikabuguxos_retox.pdf
    • http://files.potomacprojectservices.com/uploads/1/3/1/4/131405958/296e33.pdf
    • http://jotidi.truehopetravel.com/uploads/1/3/2/6/132683014/fisiberok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/8188/3047/files/simple_biodata_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/kalatexuti.pdf
    • https://cdn.shopify.com/s/files/1/0438/2857/6416/files/paulk_compact_workbench.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/xazodapesekabeperij.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7676/files/92992556782.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/angka_kejadian_hernia_inguinalis.pdf
    • https://cdn.shopify.com/s/files/1/0460/0555/1271/files/30490291424.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6473/files/diwefoselalonuxivamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2375/files/diccionario_biblico_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/29605128970.pdf
    • https://cdn.shopify.com/s/files/1/0436/2538/2051/files/puzulunawafu.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_off00006f12.bin
91f2dd280834586d9324078e08865d7ceb9db5f0f0b31edbf2f8d4d964cf513c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F12 4864 bytes
font_01_sfnt_off00007f83.bin
6f2b5b271198977efa40665c924489009cb73bc37df20f0004df205cb1fb6d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F83 10736 bytes
font_02_sfnt_off0000a449.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA449 4324 bytes

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