Malicious PDF — malware analysis report

Static analysis result for SHA-256 1591fd291a5c5e58…

MALICIOUS

PDF

43.5 KB Created: 2020-08-15 22:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56fa1b0d340b76b55616da6908bce70c SHA-1: 56f5bed7b17d9c85a0dbfb92ed4fca7ebce2335e SHA-256: 1591fd291a5c5e58c11b1120115883d00c80ff14abcb1201ca0301d4cd931454
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.cc/wb?keyword=foxit%20pdf%20apk as malicious. The presence of a large number of external PDF links, as indicated by PDF_SEO_LINK_FARM, suggests an attempt to distribute or link to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links points towards a phishing or malware distribution attempt.

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=foxit%20pdf%20apk
    • http://majavaf.bradherzog.com/uploads/1/3/1/6/131606490/6233797.pdf
    • http://files.neworleansfishingadventures.com/uploads/1/3/1/8/131856949/nuwoniluxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0345/2326/files/succeed_in_cambridge_pet_10_practice_tests_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/6662/9032/files/sobukewitawofuzerivasinix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/15687645085.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8076/files/47183835860.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/fumixemuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5224/files/24216823130.pdf
    • https://cdn.shopify.com/s/files/1/0432/2787/3440/files/40409031929.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/57198871744.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/ginizunutiba.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/61688049947.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/amsco_integrated_algebra_exercises.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_off00005f94.bin
6c95558a41ad22f41ab6db5128c635d76cbdd39e27820a7ecf1fbb07ea62810a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F94 4380 bytes
font_01_sfnt_off00006e83.bin
9cb63f6b892f692a1da547f0ef13e656c0ce75fb17f2d36894ae225cb005a037		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E83 10736 bytes
font_02_sfnt_off00009342.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9342 4324 bytes

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