Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e08741aae0ee598…

MALICIOUS

PDF

33.5 KB Created: 2020-08-15 10:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8b9337c1d233889c24b344a3b438cf5 SHA-1: 37782ee092fac28cc32bd6266a0c810d78d2d4b7 SHA-256: 0e08741aae0ee598fe1538447fb42a5ba465268b03b20bbfa75a52e65d2097b0
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text that appears to be a lure for 'nhmrc guidelines pdf', directing users to the malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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/wb?keyword=nhmrc%20guidelines%20pdf
    • http://salizifa.writerterrydavis.com/uploads/1/3/2/6/132695356/zufino.pdf
    • http://files.miltonmurray.org/uploads/1/3/1/6/131606644/nelemilor.pdf
    • http://dopabota.reinmotivation.com/uploads/1/3/0/8/130814088/dupebozidulux-zerabefi-sobuxuruzutor.pdf
    • http://mosujar.chefzanderault.com/uploads/1/3/1/1/131163635/nuvabiditidefitu.pdf
    • http://files.emw-d.com/uploads/1/3/1/4/131452938/4265815.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/zekazilumodategomajifubi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5352/1823/files/43919468039.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/49284003714.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/saroxevupekal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1447/files/breville_bread_maker_bb280_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/xasugivowigatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/xowikulenevamulabafev.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/mavikudojobulapatesiji.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/28265767501.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/zosivewufepaxejizano.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdf
    • https://cdn.shopify.com/s/files/1/0448/6879/6578/files/cercospora_leaf_spot_of_chilli.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_off00004963.bin
82b8c50ee299456f66e08a1f821bd8190a1f3cec45182461aab405236ad8d4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4963 5328 bytes
font_01_sfnt_off00005b5f.bin
9a9d95142abd96f101b7021e27e9d06e9f83912fab6194e71e23c7c49bd767f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5F 8764 bytes

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