Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9558a853089becd…

MALICIOUS

PDF

44.5 KB Created: 2020-08-19 21:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d88321acff99a902db6d1c40c8c63199 SHA-1: 24f93c8426a28a8b9c61ef77c6de77d2f9ddf9c7 SHA-256: d9558a853089becd62ab1b82a7f76aa32958cc7e0fe4cafbc175c4ee5af6b492
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a link that redirects to a malicious URL, disguised as a vocabulary exercise. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, suggesting a tactic to distribute malicious content or engage in SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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=bathroom+vocabulary+exercises+pdf
    • http://files.tellicoplainspubliclibrary.org/uploads/1/3/2/6/132681685/455bb97ae.pdf
    • http://files.pfcmooremess.com/uploads/1/3/0/7/130776072/65264bc54.pdf
    • http://files.ethsjapanese.org/uploads/1/3/2/6/132680922/nesuxora.pdf
    • http://bodel.gamechefs.net/uploads/1/3/0/7/130738970/naxaleta_furokorukorov_sanoguf_mosejuful.pdf
    • http://files.sprangerbusinesssolutions.com/uploads/1/3/1/6/131607063/cf7d78ebea4.pdf
    • https://cdn.shopify.com/s/files/1/0436/7758/1465/files/wexod.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/abnormal_psychology_12th_edition_dsm_5_update.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/13985794391.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/tivakoredipuxuni.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/mozenoje.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/manualidades_chimenea_de_carton_paso_a_paso.pdf
    • https://cdn.shopify.com/s/files/1/0437/1149/6347/files/cartoon_cartoon_summer_resort.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/42691564610.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/puradevesagijatoluv.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/xakadid.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/53973054805.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/63508307344.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/78132178865.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000594a.bin
191f1f46aadbdf492e5c1bf139284927a74438f2e3d5c8134c206da5f936df96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594A 5816 bytes
font_01_sfnt_off00006d01.bin
477e55a25a072bc46e0d8e9e7dfca9d51f96a2b683c1be5b9f719368da5be8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D01 10040 bytes
font_02_sfnt_off00008f8d.bin
6bf102e3b6f02edc66f81286f32fa0ce54e16db93fea414d2817afcdfc2f2ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8D 16108 bytes

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