Malicious PDF — malware analysis report

Static analysis result for SHA-256 090921bce34a6133…

MALICIOUS

PDF

43.6 KB Created: 2020-08-27 14:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b1926ca69d2925e282eeb00a2d488d6 SHA-1: 86fb3b13cdd91f7c0b7e52418e709aa40fa1bac4 SHA-256: 090921bce34a613355b4ce7f8ae53b221778886299fbdb4687d171309d87fd27
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=mastertech+refrigerator+manual. The document body, though heavily obfuscated, contains embedded URLs that are part of a link farm, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier also 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.cc/pify?keyword=mastertech+refrigerator+manual
    • http://files.sunshinegirlabroad.com/uploads/1/3/0/9/130969003/1500698.pdf
    • http://files.themoundcityslickers.com/uploads/1/3/2/8/132814261/fobere_gerunef_wudebidizoleg_fituja.pdf
    • http://files.reardenrealestate.com/uploads/1/3/1/6/131606330/75ca57b8ee4a7a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/botadoliwomenazexoxokinup.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/56596951643.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/48503576004.pdf
    • https://cdn.shopify.com/s/files/1/0462/7621/4944/files/asphalt_6_android_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9424/files/3690181562.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4487/files/calendario_2020_para_imprimir_chile.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/debivezejamodugori.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/subupo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/awkward_moments_bible.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/97825129057.pdf
    • https://cdn.shopify.com/s/files/1/0439/4044/6366/files/solidworks_simulation_tutorials.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054a0.bin
bdfa210be1ae32be7c9a4d68df23c24416b3b64583577dc6aec814738237e1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A0 5300 bytes
font_01_sfnt_off00006686.bin
dc0a8644626f3653c18cbb164e345c7c4aaf4d1e92632237cbdd2dfbf6778499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6686 9728 bytes
font_02_sfnt_off0000881e.bin
4d0f38e179a42a9ce5185ed1022a7b9b9453782ce8d591437a65c92f27ae96fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881E 17340 bytes

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