Malicious PDF — malware analysis report

Static analysis result for SHA-256 98da7e78f197c58e…

MALICIOUS

PDF

50.4 KB Created: 2020-08-02 15:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e124bc4d2c72f80cfc826dea5abdc46e SHA-1: 6875cc8b914dc149d6be5604a27e0e5b51594706 SHA-256: 98da7e78f197c58ec76c3e70af6617eafca7fe98eea2f594139f5e9ec4f929da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains multiple embedded links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text referencing 'Cemu update games', suggesting a lure for users seeking game updates. The presence of numerous links to Shopify-hosted PDFs indicates a link farm strategy, likely to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=cemu+update+games
    • http://files.amanda-d-pearce.com/uploads/1/3/0/7/130775734/liminibebafeb.pdf
    • http://files.soundslikecrowes.com/uploads/1/3/1/8/131871518/2f6e86aea3ae0.pdf
    • http://files.hancockfamilyfarm.com/uploads/1/3/0/9/130969045/8402023.pdf
    • http://files.wagonwheelmt.com/uploads/1/3/0/9/130969656/8260ebcce.pdf
    • http://files.musclefitsandiego.com/uploads/1/3/0/8/130813992/ratekitosadolig-tujulunoto-dosufivirowej.pdf
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/71410434540.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/kamijofafen.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/epson_wf_3520_driver.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/nenigafiwidata.pdf
    • https://cdn.shopify.com/s/files/1/0432/6188/6627/files/dudadajen.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/mxr_10_band_eq_settings.pdf
    • https://cdn.shopify.com/s/files/1/0435/7285/4939/files/euro_pro_sewing_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/24441281018.pdf
    • https://cdn.shopify.com/s/files/1/0439/9919/9390/files/42036720233.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/57084771884.pdf
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/defopabaxakinalomigebom.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/kopakesajalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/57685047505.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/sodeluzogupijiramavumakut.pdf
    • https://cdn.shopify.com/s/files/1/0434/7101/2006/files/74996025272.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/
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/defopabaxakin

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bdc.bin
e7b7ddb941cc575e3ccdb29c4210c42b1813faa77c1143f73878eaeeb0628149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDC 5056 bytes
font_01_sfnt_off00008cf9.bin
c5ff4308c5ce3ab7cdaa6cc09e3c5c074b5b3aba5880f1edeb41c0308ebc88ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF9 14776 bytes

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