Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7c9cecb8782bbf…

MALICIOUS

PDF

41.2 KB Created: 2020-08-15 04:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a82f68183546fe470b10f0ce0ac9368 SHA-1: b8b5ee555ace51893d513b277e1436cbdca0de24 SHA-256: 5a7c9cecb8782bbf7e18d3ac019a55f932b6fc0abaa4a2c4e01cf7f211c3abab
202 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and uses social engineering lures such as a download button and a browser update prompt to trick the user into clicking the link. The link leads to a redirector that likely serves further malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier strongly indicate malicious intent.

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.com/pify?keyword=online+virus+scan+android+apk
    • http://files.maxsgymoakland.com/uploads/1/3/0/7/130740492/bevir_nidawisiniki_sanirazorunuge_vekititoxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/audi_a4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/dreamsparks_windows_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/7170104558.pdf
    • https://cdn.shopify.com/s/files/1/0444/8629/5719/files/tadujitawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/gebadewotogax.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/zifor.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7321/files/lipajedemuvegedixuluxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/xuxamur.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/3948295251.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/kekanijofupesun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/savowogofoxifonikili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.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_off0000619c.bin
0d924e2c348c09948498b0351dfa9c865704c4e2b474e63729d9a7149b9ad5d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619C 5216 bytes
font_01_sfnt_off0000736d.bin
f97449065109f3916d4d15e8e83c200f842a1016234ba4c82ce3b74913c27675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736D 10740 bytes

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