Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dff79df1658a141…

MALICIOUS

PDF

47.8 KB Created: 2020-08-09 19:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc2993d3c9ebe9bd4ec0666580c8e804 SHA-1: e1314e3c629325bfa2f7ec2700d57ff71b80438f SHA-256: 0dff79df1658a141789f3f07d6b4760abcfef7fa755190e97a6edfc4884f2490
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of the primary links directs to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to legal agreements and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. 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.com/pify?keyword=difference+between+void+agreement+and+void+contract+pdf
    • http://files.papermillbluffs.com/uploads/1/3/0/9/130969505/torakepukikalep_faluw.pdf
    • http://files.amhealingarts.com/uploads/1/3/0/7/130775953/b299014fc355.pdf
    • http://files.crumblesbynicole.com/uploads/1/3/1/4/131483069/e72d2973e98.pdf
    • http://files.gwheelerfishingguide.com/uploads/1/3/1/4/131438260/paxel_sakimegojikixol_zujej_rozoja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/advanced_engineering_mathematics_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/zazovisajibonebabetime.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/66957777658.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/rapejipupexadapozanu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/20686882528.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/fofesifupufagino.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/bgp_building_reliable_networks_with_the_border_gateway_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/80941451808.pdf
    • https://cdn.shopify.com/s/files/1/0448/4952/8989/files/siwasegiki.pdf
    • https://cdn.shopify.com/s/files/1/0432/3547/5624/files/36434043132.pdf
    • https://cdn.shopify.com/s/files/1/0434/7304/3622/files/geomorphology_by_savindra_singh_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fee.bin
ba5d39f3f0d251eaf014ddc9a78d01d989075eefc258644ebe728ad7f2a505d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEE 5344 bytes
font_01_sfnt_off00008216.bin
051f2887b8f7caf07a7579403c193c0b34c22577264b873330b6b77fbcd10075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8216 9884 bytes
font_02_sfnt_off0000a3e4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E4 4324 bytes

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