Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27d57845a23f547…

MALICIOUS

PDF

121.1 KB Created: 2020-08-20 02:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22ff62f986c2662413e8c1c92a82004f SHA-1: 23747bed3904a73e7fd04794425301c401de7944 SHA-256: a27d57845a23f547e3cda09b19291fd3bd7cb9e7f7d5508ad0ea34985c905583
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the target URL. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm designed to attract traffic. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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=2014+ford+escape+se+ecoboost+owners+manual
    • http://zusuxokod.lifequestkids.com/uploads/1/3/0/8/130813747/9154125.pdf
    • http://files.fountainpro.com/uploads/1/3/0/7/130775375/43a124a24a6.pdf
    • http://files.thedaisyhouse.net/uploads/1/3/1/6/131606174/botabirimenuvufogap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/gibigisujarezalifemugezam.pdf
    • https://cdn.shopify.com/s/files/1/0440/8147/9832/files/agriculture_mcqs_books.pdf
    • https://cdn.shopify.com/s/files/1/0440/5159/5429/files/blender_3d_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/4316/4058/files/best_app_for_android_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/97985699108.pdf
    • https://cdn.shopify.com/s/files/1/0429/3640/2079/files/73386548655.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/botimapabalonej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/rilubaramakadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/13816805390.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e34.bin
0fb22863f6f35a39d727228725e6fb3b6ef2f5aa282f910e8c0015b365003122
pdf-font-stream PDF embedded font (sfnt) at offset 0x19E34 5852 bytes
font_01_sfnt_off0001b208.bin
9b707603dbb0608e932bf7cda0e7cdeb68584f4a8423a824d1b3555e9adb0019
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B208 10924 bytes