Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d3e97dbb00bad9…

MALICIOUS

PDF

60.1 KB Created: 2020-08-15 08:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a0e293409a02e632013ef907c024b7 SHA-1: b3b609663ccf8130ae725359a86d0e5c869c2dd8 SHA-256: e7d3e97dbb00bad9cdbd6626a7a369100733d5edddcf61337d716468f795d505
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to a large number of embedded links, many of which lead to a redirector service. The document body contains a URL that also points to this redirector. This suggests a link farm or SEO poisoning attack, aiming to direct users to malicious content. The presence of numerous Shopify-hosted PDFs, while benign themselves, are likely used to mask the malicious redirector links.

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=are+ice+sheets+growing+or+shrinking
    • http://tojavud.exetertrees.uk/uploads/1/3/1/1/131164538/bfcd2deeec41d.pdf
    • http://somivim.autisticsunitedca.org/uploads/1/3/2/3/132303189/e7789.pdf
    • http://files.marchingchiefs5k.com/uploads/1/3/2/7/132710491/zixipat_puwixek.pdf
    • http://wexota.summitsalesrecruiting.com/uploads/1/3/1/4/131437948/nituxa_wemodutesazaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/99399257407.pdf
    • https://cdn.shopify.com/s/files/1/0429/2096/8358/files/artist_cv_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/9108/0869/files/wimakunufibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/zuroteperaginu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/zekaduzeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/7400/1825/files/86768219291.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/39169025868.pdf
    • https://cdn.shopify.com/s/files/1/0436/9832/3609/files/92691975299.pdf
    • https://cdn.shopify.com/s/files/1/0432/1037/5325/files/51202276455.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/94972792026.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4344/files/fabojimesovebelunitodopo.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000854f.bin
a3c51b996d3c38faf1893e9dd3ea463dfa31f880aab44aca70230ff23096b28b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854F 4752 bytes
font_01_sfnt_off0000957b.bin
6229281d90b51590606cb0237f14efd2d9d033a93a637349abeb4cdceb1cddde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957B 10152 bytes
font_02_sfnt_off0000b88c.bin
15d93c5059a3168ecd56f92658996aa4d49709440c67dab53b85be63ab0baf51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB88C 18340 bytes
font_03_sfnt_off0000d4c9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 4324 bytes

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