Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a2f6265c98c161…

MALICIOUS

PDF

44.5 KB Created: 2020-08-03 12:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 129b648d3141452fd215ad4acd4687d0 SHA-1: 4ca8a14b0324721bab6974c92d4fe2ee1df40946 SHA-256: 02a2f6265c98c1618ddebc522eab4107ac640a9d42147853f259ab925b0cb865
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a quiz download, which is a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to potentially harmful content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/wb?keyword=ipl%20cricket%20quiz%20with%20answers%20pdf
    • http://files.elangamaker.com/uploads/1/3/1/4/131454034/guluj-wepisonud-lewivisafasezuv-dotapetegox.pdf
    • http://files.exuberantoiler.com/uploads/1/3/2/8/132815002/joviravegag-vunolu-xixavuk.pdf
    • http://files.kaptive8sports.com/uploads/1/3/1/3/131378950/nupitetegupomomeva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/75871814108.pdf
    • https://cdn.shopify.com/s/files/1/0441/2253/8136/files/77883203848.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/vawobupiforasinane.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/6507315407.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8918/files/46836043391.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/mebumegalurujogunedev.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/26192343491.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/csr_2_hack.pdf
    • https://cdn.shopify.com/s/files/1/0437/9728/2977/files/53066020732.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/38596193953.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/jopuperobos.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_off00006f47.bin
8bb9667e82c67e6479805ec78217443ddd0b87b8118bf42b9e9172921454857a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F47 5512 bytes
font_01_sfnt_off00008221.bin
1698e1c6beea5d044f5c6a8ee70ff7737bce72223a8a297389a1d2884698e0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8221 10296 bytes

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