Malicious PDF — malware analysis report

Static analysis result for SHA-256 0919e0372f5713f8…

MALICIOUS

PDF

42.4 KB Created: 2020-08-07 08:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e82127d78710edeba9700fb3d70711 SHA-1: 72b0c6afd5e3629d07d1f4f488b0cca2b220d276 SHA-256: 0919e0372f5713f85b8b4816dae410cc9fbe84e64aaf9d73d22753bd7771f5bb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=hernia+diafragmatica+perros+pdf
    • http://files.anjasinternationalworld.com/uploads/1/3/1/4/131408942/xiledezuxa-jigidamesa.pdf
    • http://files.eibenteaching.com/uploads/1/3/1/6/131636819/fepabudarilabotar.pdf
    • http://files.wisefishworld.com/uploads/1/3/2/7/132712214/bopid.pdf
    • http://files.rebeccaocainlaw.com/uploads/1/3/0/8/130813646/73312de.pdf
    • http://vuxebuw.katarzynasawicz.com/uploads/1/3/1/6/131637136/f96d39e85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/73524244278.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/xuzizozofe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/kumunegexazovoburiwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7230/files/transition_words_to_start_a_paragraph.pdf
    • https://cdn.shopify.com/s/files/1/0438/9873/2696/files/movos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4387/files/sukigovowapokusezexeses.pdf
    • https://cdn.shopify.com/s/files/1/0435/8461/8653/files/23542926340.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/alkyne_reactions_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/mpsc_blank_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7707/files/kenworth_8_bag_air_suspension_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/86941190225.pdf
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/30516618920.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a63.bin
5acef7ac700b467454cda0107b8de041021827a2dd45ef606d7d8369200575e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A63 5192 bytes
font_01_sfnt_off00006be9.bin
f0a2e76b1a8f000c7e0efcc2f0f2cc647ed32d8f8000539db6bffd69241cb6bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE9 10056 bytes
font_02_sfnt_off00008e52.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E52 4324 bytes

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