Malicious PDF — malware analysis report

Static analysis result for SHA-256 1072e903ad8e8d7b…

MALICIOUS

PDF

51.7 KB Created: 2020-07-30 23:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48260b0023e3288ffed842e455e73453 SHA-1: a923bcab7581eb83fdc69b24123370de0f29abce SHA-256: 1072e903ad8e8d7b9d77fc6602255a1a77806c5d10c5a140f9deb49543bceb78
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged it as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Catalasa en vegetales pdf'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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=catalasa+en+vegetales+pdf
    • http://files.cmforrester.com/uploads/1/3/1/4/131406892/3102351.pdf
    • http://files.dorakrincyinteriors.com/uploads/1/3/1/4/131438804/wititujup.pdf
    • http://files.techtalent.org/uploads/1/3/1/3/131381428/4627687.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9565/4567/files/fitufalefaxoni.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/weribowagujaja.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/welunazakudidipipedemapur.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0645/files/16103688691.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/kajurumelevigedojegewoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lonuxifipepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8635/6375/files/guwumomolotitixudawobozeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/wazorafizifono.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/lanoginoriwojategopeved.pdf
    • https://cdn.shopify.com/s/files/1/0432/4179/9843/files/29346619123.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/dobaluxuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/49867250542.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/89042193075.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_off00008bd2.bin
5851b9a5652ae5c4071290e5a1d0040237cdeb8f05174aea7ba2b23a6491ef28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD2 4828 bytes
font_01_sfnt_off00009c5b.bin
2ecc372b0a9a75603e6af2a4d95686389736228b087834173e0e948d1e2589f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5B 10916 bytes

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