Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e719271b3319fd1…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 17:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ac4b17d9b2d1cc7e8309bda397fb90f SHA-1: b8d1e24fd9c23dd3e6fce781c2850cb3d3c896ca SHA-256: 0e719271b3319fd1226ba01800e36f04fff39c47d26b5839eb86d31dd10deb65
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 of which point to external resources, suggesting a link farm or redirection strategy. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links leads to known malicious infrastructure. The document body, though partially corrupted, contains text related to 'division worksheets grade 3 with pictures' and a URL, reinforcing the lure to click on embedded links. The presence of embedded JavaScript, though not detailed, further supports the potential for malicious activity.

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.com/pify?keyword=division+worksheets+grade+3+with+pictures
    • http://files.psi-the-project.com/uploads/1/3/1/6/131636891/zazuzimaxugexu-pimeb-torufiloberot-mojekorapawux.pdf
    • http://molaj.sognocakes.com/uploads/1/3/0/8/130874431/1000475.pdf
    • http://files.westtabernaclembc.org/uploads/1/3/0/7/130740066/luzelozokid.pdf
    • http://files.yogicozy.com/uploads/1/3/0/8/130813732/wikanunadikuvada.pdf
    • http://joveregox.vintageousproductions.com/uploads/1/3/1/1/131164066/dutexulo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7971/9330/files/possessive_case_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/89716345612.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/ammeter_voltmeter_wattmeter.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/83194085604.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/guided_tour_of_the_holy_land.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3272/files/pomok.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/lefumezewezu.pdf
    • https://cdn.shopify.com/s/files/1/0452/2721/2957/files/16380500066.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/78385838450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/mibipot.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_off000066eb.bin
ad425c66d3f732258cdb1e639da1441b2fae1adb8304e290b9acfd5f7ab0f484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EB 5684 bytes
font_01_sfnt_off00007a58.bin
e34bb5ac1bef93499f8481223b663e04468ac51d4c1f23a99bd7ece8452c494b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A58 10112 bytes

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