Malicious PDF — malware analysis report

Static analysis result for SHA-256 102e320fe4a6c397…

MALICIOUS

PDF

61.8 KB Created: 2020-08-07 23:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63e9215c5aa33524f178247a15521b3 SHA-1: 79b3c88b7a382b19e21f6182786ede27b4771ef8 SHA-256: 102e320fe4a6c3970377fd8f2dac36b981b4ab12900fd09e4921bea219a0f298
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and link farm behavior point towards a malicious document designed to redirect users or manipulate search results.

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.ru/pify?keyword=minerales+alimenticios+pdf
    • http://files.gigifloyd.com/uploads/1/3/0/7/130776611/6ac396143fc7989.pdf
    • http://files.transformationextender-community.com/uploads/1/3/0/8/130874063/purenukovodazi.pdf
    • http://files.celestecrystals.com/uploads/1/3/2/3/132303175/6ccd315ab77e03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/pesig.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/zigepowefeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/2331/9715/files/fuxaperejezixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/26849104583.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/unity_debug_log.pdf
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/iterm_color_schemes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/66087314300.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/42567022235.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/mumokigazot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/refrigerator_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/hunger_games_1_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/nomif.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_off0000b3d1.bin
6da48ba1b3292cacc83894f5e881d58e94684438584504aef41c1f0bbefd2582		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D1 5304 bytes
font_01_sfnt_off0000c5ce.bin
4b808bb93dd0fccd099675657fd171e4affda6c03eeb09269508ef6b27795250		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 10816 bytes

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