Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e716552cbcc61d…

MALICIOUS

PDF

45.8 KB Created: 2020-08-11 21:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23cb29cacfc1e1aa841b6c22c3d64cea SHA-1: 30566c4509fb81a7952389f0409b879b867a450c SHA-256: 77e716552cbcc61d9065e1f031a35ad0ea9b109b45d400eee2916911a035c925
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector (`ttraff.cc`) which is flagged as malicious. It also exhibits characteristics of a link farm, embedding numerous links to other PDFs, likely for SEO manipulation or to host further malicious content. The presence of a 'download button' lure reinforces the deceptive nature of the document. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a malicious intent to redirect users to harmful sites.

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.cc/pify?keyword=electrical+engineering+mcqs+pdf+free
    • http://files.elevatetoprevail.com/uploads/1/3/2/6/132696280/3645269.pdf
    • http://files.nworparenting.com/uploads/1/3/2/8/132815785/1503d8c96de32a.pdf
    • http://files.metaphysicshouse.com/uploads/1/3/0/7/130739974/4cb6d313aafec32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/39773829928.pdf
    • https://cdn.shopify.com/s/files/1/0433/5140/8799/files/lithium_bromide_water_absorption_system.pdf
    • https://cdn.shopify.com/s/files/1/0452/8229/5969/files/51115156345.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/fiperizunenuxadojumabujiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7520/7322/files/93485814108.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/sanibafilotuzotanawabe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/vavujutagitegajuda.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/export_google_books_to.pdf
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/tuputolasikalojebepum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99594865370.pdf
    • https://cdn.shopify.com/s/files/1/0436/2128/6050/files/dazigijekibaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8304/files/wafus.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a4.bin
23f4d97ded5f935192b5e0ce561fed86d83b05abee2acbc1e3ac81e7836173c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A4 5556 bytes
font_01_sfnt_off00007865.bin
6ccbdbbbf45f0c68c2fad804b1152d1834cde9ee399f2c7070a59df09c9a4ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7865 16452 bytes

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