Malicious PDF — malware analysis report

Static analysis result for SHA-256 6714d2948418ade1…

MALICIOUS

PDF

44.0 KB Created: 2020-08-08 22:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54cb10af6a82f5561a907d7d8875a425 SHA-1: 2c2173d18106c31cf406b5c799ca892a4b2614e7 SHA-256: 6714d2948418ade10a9bd98af5ab2d2e9c50fae5fbb8da40ce3ff894ba04433f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector service, which is a common tactic for distributing malicious content. The document body, though heavily obfuscated, contains text suggesting a lure for free sheet music, which is then linked to a malicious URL. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=bennie+and+the+jets+piano+sheet+music+free+pdf
    • http://files.aqualoscabos.com/uploads/1/3/0/8/130873807/bozemodurezeridawu.pdf
    • http://files.lambdalambdasigma.org/uploads/1/3/0/8/130813428/65629a9c1bde.pdf
    • http://files.carolynwilsonartist.com/uploads/1/3/1/4/131407802/3022016.pdf
    • http://xuzero.psms-music.org/uploads/1/3/2/7/132740214/467082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/dujajubojub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0187/1512/files/vespa_lxv_125_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/39915168793.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/meaning_of_social_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/96577926284.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1821/files/17215304335.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8912/files/23550016080.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/turugesuratirulija.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/33091423323.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5025/files/15076865198.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/kisagejexivezirabojiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/ielts_speaking.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_off000051f6.bin
2b2935535a41b483945f679d6945cca310021c9f445bafd36b8b3c35894b2af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51F6 5368 bytes
font_01_sfnt_off0000640e.bin
50433e3dcef404e01adfe9df91a52a14e5aa6b876ac56c1ec1c57552d65a3e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640E 14900 bytes
font_02_sfnt_off00009292.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9292 4324 bytes

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