Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e084744c70d9aa9…

MALICIOUS

PDF

43.4 KB Created: 2020-08-21 10:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eea4b9d3357e85efc18c639843f3b4d SHA-1: 10c8ba03e1f72ff07da48d0c708c2b983aa8cec0 SHA-256: 7e084744c70d9aa9b18da8c2375618d49362b885ccaaca5f773c937db1b69207
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'samsung gear app store apk'. The document body also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/pify?keyword=samsung+gear+app+store+apk
    • http://nujataze.finddani.org/uploads/1/3/1/4/131437254/naxepumabuwewi.pdf
    • http://files.high-horse.co.nz/uploads/1/3/1/6/131636927/c5ca1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/31726624767.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/workout_program_for_weight_loss_and_muscle_gain.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/98135744213.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/chronic_charcot_deformity.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7471/files/66732189496.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/leadership_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/examenes_cae_con_soluciones.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/raxosudezisawezewexon.pdf
    • https://cdn.shopify.com/s/files/1/0432/7804/1244/files/47235734262.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054ba.bin
d3a0dbfaf178ad573099393907cd19a5ab7041e05258d14d89bf20e04e50ed96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54BA 2880 bytes
font_01_sfnt_off00005ee9.bin
7e21d71146e1cd73401c27476e45c5afc1752b5f024524f3383148a8965a26fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE9 5108 bytes
font_02_sfnt_off00007025.bin
d7a3d61a0b10deb7df8e01922b8dfb00eae369dd949ebed5efea84b889768a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7025 10120 bytes
font_03_sfnt_off000092be.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BE 4324 bytes

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