Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c59e5361846d4c…

MALICIOUS

PDF

46.5 KB Created: 2020-08-12 12:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05ba0a07589c8ccaa695c37f68130289 SHA-1: 8f3d0312b0fac71af5afae59375d663f553161d6 SHA-256: 85c59e5361846d4cb5544f69d21c0ac2114db7f8c4aa35b41119d2de433ad238
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 resources, including a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting an attempt to drive traffic to malicious infrastructure.

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=vector+dot+product+and+cross+product+example+pdf
    • http://files.lvmobilemasters.com/uploads/1/3/1/3/131398477/1858923.pdf
    • http://files.northernpridesportsacademy.com/uploads/1/3/0/8/130813364/novileveguno.pdf
    • http://files.kissmeforeverweddings.com/uploads/1/3/1/3/131380345/bekotijuxatukakile.pdf
    • http://files.chasingbears.com.au/uploads/1/3/2/6/132680781/jodifexave.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/wibidenimapebupakujasimi.pdf
    • https://cdn.shopify.com/s/files/1/0436/5323/4841/files/english_russian_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/bihar_district_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/76774281720.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/wasuwuwegowolejogeni.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/jotek.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/abbey_road_50th_anniversary_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/tidomigefe.pdf
    • https://cdn.shopify.com/s/files/1/0447/8740/0864/files/diffusion_of_innovation_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/27937971797.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/7641725333.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/lavobufafurixupoduzinatij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8903/files/775940832.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_off00007076.bin
b3d8e2d81149262440f539435ccd97b151e1d3669cb0b9f47f8281d075de3fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 5336 bytes
font_01_sfnt_off00008286.bin
2717efc83a4aa7964b925fdddce3cafda4afaf138e76d3cf4d7fddceabc1459a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8286 13092 bytes

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