Malicious PDF — malware analysis report

Static analysis result for SHA-256 08eee8ed335975dd…

MALICIOUS

PDF

62.2 KB Created: 2020-08-05 03:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fce6dbd737a727fbbeeb8b68df56413d SHA-1: 92cd6100123edaa9796a41f1b20e8233831f340a SHA-256: 08eee8ed335975dd8a264d39a7f46533b3bf03e93df903948c5eebd0513e6142
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to malicious infrastructure. The document also functions as a link farm, with many embedded URLs pointing to external PDFs, likely for SEO manipulation or to obscure the malicious link. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or redirection attack.

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=libros+de+algebra+booleana+pdf
    • http://files.aviationsecuritymanagement.com/uploads/1/3/1/3/131398182/nipofokanu.pdf
    • http://files.908elmstreet.com/uploads/1/3/1/4/131454899/najula-wumulupotumo-parewok-bitapapufo.pdf
    • http://files.transcendentcmc-llc.com/uploads/1/3/0/7/130739564/lebajerawovib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/clep_psychology_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/99078677004.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/sixalorobosura.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65028435792.pdf
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/applied_photographic_optics_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0435/5856/8097/files/79073489093.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/92244978958.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/95028250864.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/10315687639.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/milenadokuwuxesunare.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/zapusalubimameni.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/abelian_group_properties.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_off0000aa32.bin
d8be384f44375de270591c7e7605c8bea1733d55f0441f1b2632d5e0359c8def		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA32 5288 bytes
font_01_sfnt_off0000bc39.bin
3b966dee5da1731cf380b2d520fb1a80624bce9a5fc3c2865a124798a430eb2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC39 14688 bytes

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