Malicious PDF — malware analysis report

Static analysis result for SHA-256 993abd69a31dc2f5…

MALICIOUS

PDF

50.2 KB Created: 2020-08-30 17:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9599a1b46cb27da4fdf69b3addaa881 SHA-1: 2fe3dc038f2bd57233937054b4faf4c88173a0ce SHA-256: 993abd69a31dc2f58d77271341ccc70734c536f919971955a943abd94dc0a6e0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/wix?keyword=brainwashed+republic+pdf+download'. The document body, though heavily obfuscated, also contains this URL and references to PDF downloads, suggesting a lure. The presence of many Shopify links points towards an SEO spam campaign, where the malicious redirector is likely used to distribute further malware or phishing content.

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/wix?keyword=brainwashed+republic+pdf+download
    • https://cdn.shopify.com/s/files/1/0438/3683/3954/files/expresiones_mas_comunes_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/nadotorerovij.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/zasewakadumapexolalupemum.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/givuvadexa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/tovebemodowegumelonapu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5733/8776/files/wejiruw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1607/files/lufajigaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/duzoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/jiwigavu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1157/0838/files/p3d_v4_nvidia_inspector_settings.pdf
    • https://cdn.shopify.com/s/files/1/0460/3143/7983/files/principales_representantes_del_posit.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_off0000798e.bin
459e32d430d6aadec4b00f4272433d21968bb280fe97d3cdafa791e78e5cee33
pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 5324 bytes
font_01_sfnt_off00008b9b.bin
7721e0ace5df7323558bc07f43b924d7a3be9c991114f94f06e68c5bd4bce29b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9B 10172 bytes
font_02_sfnt_off0000ae54.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE54 4324 bytes