Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1158e72698449a…

MALICIOUS

PDF

51.2 KB Created: 2020-08-15 00:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe5d2cdb1b12997e53e08dcf75a8f1a5 SHA-1: 2a892e74415b7a7af27c6e77951aded780a9cccb SHA-256: 7a1158e72698449a94b359841e548ba5f74121ab5aacfd9e7896c96a64979724
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed to obscure malicious content. One prominent link, 'https://ttraff.cc/wb?keyword=divine%20mercy%20chaplet%20for%20sick%20and%20dying%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly indicated maliciousness.

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/wb?keyword=divine%20mercy%20chaplet%20for%20sick%20and%20dying%20pdf
    • http://files.maggielynnelawrence.com/uploads/1/3/2/7/132710784/damefofapo-tiwowunak-watadenutu-kiwonevazig.pdf
    • http://files.befitnow.co.uk/uploads/1/3/1/1/131163615/notikipi-mirajomal.pdf
    • http://files.janestraveladventures.com/uploads/1/3/0/7/130740586/mabisaruvotu.pdf
    • http://bugakilol.piperspillows.com/uploads/1/3/0/7/130740490/xibefemo.pdf
    • http://bomomox.centralwiballoons.com/uploads/1/3/2/8/132814930/ketuwabigevasumeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3255/9267/files/94104891673.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/wipepokakateka.pdf
    • https://cdn.shopify.com/s/files/1/0440/3727/5813/files/wofazi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/3056871587.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4791/files/vibadotomunavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/pediatric_advanced_life_support_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/hampton_bay_remote.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/zinuxeko.pdf
    • https://cdn.shopify.com/s/files/1/0434/2713/5640/files/dalifavogosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2923/files/86466204366.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0412/files/44798793341.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/4187852151.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/54284974600.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/cat_c13_engine_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9030/files/temple_run_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_off00008755.bin
ff7808c0d4732c576c9b871d4dea660c6b90ff773d8d7e86d443d1b4db5ca719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8755 5796 bytes
font_01_sfnt_off00009aef.bin
f70a0ac4321967921f09c29e5bc344348bf3993baa1473845680da3987b79d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEF 10600 bytes

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