Malicious PDF — malware analysis report

Static analysis result for SHA-256 844b9000007df855…

MALICIOUS

PDF

72.7 KB Created: 2020-10-19 02:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9cd6fb63e9e865794dfd619fdd5036 SHA-1: 66cb877b71d4e845cc6ee8a89f27dfc7331e0d91 SHA-256: 844b9000007df8557649500c1e155127cae2e3ea7d7d8476f0eab5a2d58427d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that matches the heuristic finding, suggesting the document's primary purpose is to redirect users to malicious infrastructure. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or scam attempt.

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.club/123?keyword=lbj+great+society+speech+pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdf
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdf
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/xelewejaf.pdf
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/182483a4c2e4cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0481/7987/1911/files/elmos_world_computers_mr_noodle.pdf
    • https://cdn.shopify.com/s/files/1/0486/1889/7573/files/android_get_style_programmatically.pdf
    • https://cdn.shopify.com/s/files/1/0438/2153/1293/files/lily_aerin_savage.pdf
    • https://cdn.shopify.com/s/files/1/0488/4080/2469/files/identidades_trigonometricas_formulario_calculo_integral.pdf
    • https://uploads.strikinglycdn.com/files/ff29cf91-d151-4a10-a15c-f810ff2b7eb1/25536898915.pdf
    • https://uploads.strikinglycdn.com/files/19cccd48-2360-477e-9d0c-9f4c145e2ecf/3279767255.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/guitar_hero_3_pc_download_2020.pdf
    • https://cdn.shopify.com/s/files/1/0484/8307/4209/files/dd_style_games.pdf
    • https://cdn.shopify.com/s/files/1/0431/7115/2023/files/29577374719.pdf
    • https://cdn.shopify.com/s/files/1/0432/0863/8632/files/zewob.pdf
    • https://cdn.shopify.com/s/files/1/0462/6176/4245/files/zoxirilexaratari.pdf
    • https://cdn.shopify.com/s/files/1/0501/4667/2805/files/76221816491.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/north_clay_school_board_meeting.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_off0000dd33.bin
bf49466dd373d22563bb639c1bdb48feeed54dc61e6f678c83eeb5caebfbfd41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 5644 bytes
font_01_sfnt_off0000f06e.bin
e947c43715b17e158ee83776baf5917c8a2d0aebeafd948b1678df2dade82ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 11000 bytes

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