Malicious PDF — malware analysis report

Static analysis result for SHA-256 890918b40ca8eb84…

MALICIOUS

PDF

53.4 KB Created: 2020-08-22 23:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df61d675c99be7a2f72a355e3c1f17ac SHA-1: 9116374abc75243811aff83c09e95d22760ff457 SHA-256: 890918b40ca8eb840a5ae0d0602b5c7600f7f6b9090b47c145555f31d87e1350
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'assignment cover page'. The presence of numerous external PDF links, many pointing to benign Shopify domains, indicates a potential SEO link farm strategy to obscure the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.cc/pify?keyword=assignment+cover+page+word+format
    • http://didisowiv.villaserenacabo.net/uploads/1/3/1/4/131406149/4886063.pdf
    • http://files.obie-music.com/uploads/1/3/1/4/131436978/3229818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/breaking_free_beth_moore.pdf
    • https://cdn.shopify.com/s/files/1/0433/4940/9960/files/sintomas_de_angina_inestable.pdf
    • https://cdn.shopify.com/s/files/1/0434/8218/5893/files/zaxugomifala.pdf
    • https://cdn.shopify.com/s/files/1/0438/7989/1099/files/xopepenekeje.pdf
    • https://cdn.shopify.com/s/files/1/0432/8918/2376/files/dexexonupiporeno.pdf
    • https://cdn.shopify.com/s/files/1/0430/0737/7561/files/26658011179.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/tefatalukatusukedujoboxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/93124290651.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/vizikusiro.pdf
    • https://cdn.shopify.com/s/files/1/0435/7701/6483/files/88740526708.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/vilubeleb.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5978/files/fifolanubuvosototalipekit.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a05.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A05 2828 bytes
font_01_sfnt_off000083ff.bin
40ce03b928d75c9724ffe2f953fd14d9ca61335be7195251ffd647b5b77190c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FF 5372 bytes
font_02_sfnt_off00009635.bin
3208c3803ed863c2e4da91871cc2ac6f9e8b39e30303c7c7c57dc1d92fbc8b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9635 9868 bytes
font_03_sfnt_off0000b7e8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 4324 bytes

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