Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df188b2e323eb45…

MALICIOUS

PDF

41.7 KB Created: 2020-08-07 06:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25db9c871f9ebe3b60d16225e310b024 SHA-1: 662a1c92f6aea5747510f561ad36d950dc27cc0a SHA-256: 6df188b2e323eb4566ca4dcffed343fe360d5c83c9c89235b468b0b9bde2a0a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong likelihood of this document being used to drive traffic to malicious sites, potentially for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=texto+argumentativo+y+expositivo+pdf
    • http://files.waymoretrans.com/uploads/1/3/2/6/132681901/begakodakabibulivaru.pdf
    • http://files.rowanfirstyearwriting.com/uploads/1/3/0/7/130739379/vedumilagex_wexifegaki_tafawufinujixa_danoxedafog.pdf
    • http://files.carolynmartinodesign.com/uploads/1/3/1/4/131453896/4483363.pdf
    • http://files.craftofscientificwriting.com/uploads/1/3/1/4/131437765/vusedavesulu_ratalemos_bakojedif.pdf
    • http://files.mb-freestyle.com/uploads/1/3/1/4/131453124/gegukogoloro-kakopetedejes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4587/8950/files/44669379772.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/fallout_4_enhanced_vanilla_bodies.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/13988834862.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/26096375396.pdf
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/1566400801.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/algebra_formulas_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/oxford_discover_2_workbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0444/2229/9815/files/gta_5_how_to_install_gameconfig.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/96340735165.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/melod.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/zodenar.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/80135653156.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/konajuzeza.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3248/files/78378970821.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_off00006375.bin
fe0a3fd896fd53bbd41d2ef2d9077045962e030edfdb04e7cabf14d7fc66b491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 5508 bytes
font_01_sfnt_off00007631.bin
b1459c6274ce561daa091422f72be349a51f9b92c39eb547e39fc0ae6704814f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 10952 bytes

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