Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b1806d395a9aca…

MALICIOUS

PDF

50.3 KB Created: 2020-07-28 04:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6964c0b71dcbe8d1f8af598ea58ea643 SHA-1: c4dd1cbfcd93532a086033c493b6a41c80b78adf SHA-256: 12b1806d395a9aca4653eb5940737df5bc3427f500d75d26069055f5b10aaad5
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous links to external PDFs, many of which are hosted on Shopify. One critical heuristic indicates a link to a known malicious redirector infrastructure. Additionally, a high-severity heuristic flags the document for attempting to trick users into installing browser updates or extensions, a common social-engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=brave+browser++exe
    • http://files.nellkoopmanart.com/uploads/1/3/1/4/131482826/a242aafcc7b156.pdf
    • http://files.railproductions.com/uploads/1/3/1/8/131856433/butonogox-tejuweve-xusezozasevasaz.pdf
    • http://files.acsnutritionfitness.com.au/uploads/1/3/1/3/131379615/pidirudoxutal_fidivegedewiwo_bijesagoxid_fanowago.pdf
    • http://files.ellenhanley.com/uploads/1/3/1/4/131437593/2051962.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/27116221673.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/48219388942.pdf
    • https://cdn.shopify.com/s/files/1/0434/8120/2854/files/kojitirinekebomutoxurakex.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/87859644801.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/51093519451.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/rokosezidifasu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8725/files/82894148773.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0440/6951/9510/files/66597874503.pdf
    • https://cdn.shopify.com/s/files/1/0428/8351/4527/files/86547764333.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/towiduligowiwuni.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/60949148480.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_off00007352.bin
e41c87253a75b1d334282925273d8bb3c759220a0c75c27bd1ded9522186a6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7352 4612 bytes
font_01_sfnt_off00008314.bin
a375060e3e370fdd84544adc974c94f23f922328910d86324db3e8b7cf9a48dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8314 10656 bytes
font_02_sfnt_off0000a72f.bin
275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA72F 16112 bytes

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