Malicious PDF — malware analysis report

Static analysis result for SHA-256 616802439bd1d4f5…

MALICIOUS

PDF

55.1 KB Created: 2020-08-28 06:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0026fffb0792ff2a6b5f87a3596efe3 SHA-1: a8b37f299d0155ac6c1c2461a6af60a43ed280b2 SHA-256: 616802439bd1d4f53ebcce63526cbf553041565b4ec75533c982d039d48cc186
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting an attempt to lure users to malicious infrastructure.

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=musculos+de+la+expresion+facial+pdf
    • http://files.weddinglocationsorlando.com/uploads/1/3/1/3/131397946/tarefu.pdf
    • http://kefesor.peopleofbudjbim.com/uploads/1/3/0/8/130814674/5338506.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1629/6360/files/equidad_y_movilidad_social.pdf
    • https://cdn.shopify.com/s/files/1/0439/6669/3534/files/47916604118.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/comfortably_numb_solo_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0440/6611/1638/files/casio_hr-_8tm_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0418/files/98489265527.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/rupaperu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/fosepozunimorepivaganere.pdf
    • https://cdn.shopify.com/s/files/1/0448/0483/3441/files/hollander_interchange_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/banoka.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5355/files/xavameximopanigen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11383010616.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/26447626037.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1809/files/bricks_n_balls_game.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/vafirimaveroritunanoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/fulagawevirakuwusitalexi.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_off00009773.bin
23e9faf187a1a85e2ffefe1614d3e07b69be901d83353bea8ad89670da44def6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9773 5220 bytes
font_01_sfnt_off0000a953.bin
731845ce6d06c8f55e206a293aa8d2df55d4a18864f1792b9ca2369691b00fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA953 11416 bytes

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