Malicious PDF — malware analysis report

Static analysis result for SHA-256 39455230d22db88f…

MALICIOUS

PDF

49.3 KB Created: 2020-08-30 17:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce5fd6bd238483ee609c0d3036ee9078 SHA-1: 740bba8116dfeb91e515e9138a6146cb4eca8ec9 SHA-256: 39455230d22db88f834812500199842f8a0009370116d9b0480c49cf76cce531
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a motor datasheet and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness.

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/wix?keyword=emax+xa2212+brushless+motor+820kv+datasheet
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/lelemixorekalodix.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/bihar_board_12th_exam_form_date_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/jopopamilikimejududaso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/83583068491.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/79655828443.pdf
    • https://cdn.shopify.com/s/files/1/0435/2091/7668/files/2017_hypertension_guidelines_made_simple.pdf
    • https://cdn.shopify.com/s/files/1/0440/5516/7126/files/listening_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9367/2604/files/99139470879.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/excel_formule_arrondi_2_dcimales.pdf
    • https://cdn.shopify.com/s/files/1/0451/4299/9194/files/pdf_file_merger_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/78822425339.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/72848320731.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/41353847731.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/ruvabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/33418874734.pdf
    • https://cdn.shopify.com/s/files/1/0428/9409/8598/files/examen_final_de_espaol_primero_de_s.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_off0000544e.bin
4635f25205f549dfe6e802b717e77c986ee9c7affce12e41f6709f7867431f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x544E 2948 bytes
font_01_sfnt_off00005eca.bin
8486e5cc5e79e87fc9641100cbc55a3d82bcc177b3669cee8956a9f5ffb55904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECA 5872 bytes
font_02_sfnt_off000072af.bin
b1630728049c3d955a3576058d7dd466f90c0d74c638ef310dae8b972385f2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AF 14996 bytes
font_03_sfnt_off0000a258.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA258 16164 bytes

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