Malicious PDF — malware analysis report

Static analysis result for SHA-256 0748ee1ad8836360…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 13:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e328fa48d9225e4937362e1e04cb1ed2 SHA-1: 8ddb7e05d3e3ffabf35089aacec12800846c024c SHA-256: 0748ee1ad8836360afbe9545b5eedc147b3ddd41b815740c3c4916bbb1c68099
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure further supports a malicious intent. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting it's part of the lure.

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/pify?keyword=jll+residential+report+2018
    • http://basovi.melissakochfinearts.com/uploads/1/3/2/8/132814930/digusap.pdf
    • http://files.hapabq.org/uploads/1/3/1/4/131406258/posetigubofi.pdf
    • http://files.moobaastrongmangym.com/uploads/1/3/1/4/131483098/1264324.pdf
    • http://files.fredoniapubliclibrary.com/uploads/1/3/0/8/130814408/xifatarugogobumare.pdf
    • http://files.windowpaintingcalgary.com/uploads/1/3/2/6/132682630/3217800.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/xemufotogevatofedejej.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2357/files/punuluzapoboxuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/bonawoxuzunaza.pdf
    • https://cdn.shopify.com/s/files/1/0446/5275/7155/files/breadcrumb_trail_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5395/files/87789879481.pdf
    • https://cdn.shopify.com/s/files/1/0440/2325/1094/files/mining_diamonds_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/bacchae_woodruff.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/pelarimuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/61030812111.pdf
    • https://cdn.shopify.com/s/files/1/0428/7840/2723/files/autocad_2020_commands_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4687/files/38077224000.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/printable_worksheets_pre_k_math.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_off00006291.bin
43e30c8aa08d5e1eb48c8806271aca348680a3861dff8069f15d2eaf37caf3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6291 5464 bytes
font_01_sfnt_off00007528.bin
c918046e8f28831ee98cf424e5bbd9bc887d2e3df127310ca5c37dc9e8935b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7528 10500 bytes

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