Malicious PDF — malware analysis report

Static analysis result for SHA-256 638a460720037119…

MALICIOUS

PDF

41.5 KB Created: 2020-08-17 13:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9670146afcd8c4d64f31ffc4b08d50d7 SHA-1: 88c5c9b302dd830d25927b1f0d1e35da77135714 SHA-256: 638a46072003711939ab87c37d04c59ea3f60b2c07666f679fe50e31e43ba542
170 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for free content, combined with a "download button" heuristic. The presence of a malicious redirector and a link farm indicates an attempt to drive traffic to malicious sites, likely for further exploitation or phishing.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=u+letter+whatsapp+status+video++free
    • http://mibaw.stopthatburglar.net/uploads/1/3/1/0/131070450/xedajaweg.pdf
    • http://zokure.okpeo.org/uploads/1/3/0/7/130739385/komarosimigor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6743/9259/files/2543894199.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/3ds_mii_qr_codes.pdf
    • https://cdn.shopify.com/s/files/1/0454/6196/2910/files/william_exercise_for_low_back_pain.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/lagajip.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/rafitezonafixemexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8113/7316/files/biduludosafawul.pdf
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/73780582993.pdf
    • https://cdn.shopify.com/s/files/1/0435/6866/0643/files/77019948311.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/investigators_of_arkham_horror_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/zezonowudekojaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1560/files/65296902595.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_off000064dc.bin
021e3d9a5980586ea259282f4eafd57eef0ce583fc1dd17694968774a85976b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DC 5272 bytes
font_01_sfnt_off000076d7.bin
02e20c131d7ce3971bb2d93bab7991b4a4b1c99c92a3543123ea57060f175e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D7 10008 bytes

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