Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca4d79fcd8c55a4…

MALICIOUS

PDF

37.5 KB Created: 2020-09-03 07:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2eee860d3e3252b53031e2f52d22da1 SHA-1: e3c69dd2c6f6149bfed8b0315d23e99bb6302e10 SHA-256: 6ca4d79fcd8c55a4f8673b9a04d97c5abf5855818e985a7974910b2cce763973
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'Android 6 update'. The presence of many external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content. The primary IOC is the redirector URL used in the lure.

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.club/wix?keyword=apel+in+asteptare+android+6
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/217d68_b95a09de58164a149a0d7f1b3fffd469.pdf
    • https://static.usrfiles.com/ugd/dd6616_260a3c67ffd949de8531667ce6895449.pdf
    • https://static.usrfiles.com/ugd/594ae5_57153295bcbf454f8d3de9737e042117.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/foramifonowuj.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/27846964258.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/botapepumapimenerinejunaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4743/files/65638270202.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/rososorowakimujujabelope.pdf
    • https://cdn.shopify.com/s/files/1/0431/1210/4103/files/application_for_government_job_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/jubaxesiso.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/gixiworitufepokitonurer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.pdf
    • https://cdn.shopify.com/s/files/1/0438/2703/6322/files/twin_peaks_the_missing_pieces_free_online.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_off0000559e.bin
886361c9499a8d12fec34071c8d594904ba596ffc936907f684cf358cbcb1182
pdf-font-stream PDF embedded font (sfnt) at offset 0x559E 5096 bytes
font_01_sfnt_off000066fe.bin
39b9b60b4157d926e827f9e54200c9e5434eb1b2856a07b2afb39ceb79677870
pdf-font-stream PDF embedded font (sfnt) at offset 0x66FE 10064 bytes