Malicious PDF — malware analysis report

Static analysis result for SHA-256 236e728f407f0974…

MALICIOUS

PDF

58.1 KB Created: 2020-08-16 19:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ee09c52280a8c18dc63d35b8211f81 SHA-1: d7d288fe90653d1202ee23e468f0ee73323967aa SHA-256: 236e728f407f09747552095ca115fadb13932423eba3d10f85d7ad4a3844065d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious sites. One of the primary redirector URLs is https://ttraff.ru/pify?keyword=corporate+governance+report+format+for+annual+report, which is flagged as malicious. The document body, though heavily obfuscated, also contains this URL and other benign-looking Shopify URLs, likely to lend legitimacy. The ML classifier strongly indicated maliciousness.

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=corporate+governance+report+format+for+annual+report
    • http://tijiraxo.positivelyobedientcanines.com/uploads/1/3/0/8/130814328/tazidewadinaxu_nesojiruvab_tibomux_nopopilopak.pdf
    • http://files.thebrewnextdoor.com/uploads/1/3/1/8/131856108/wibesenov_ruduzizuvupo_wotubirujirixu_mexozajuzuw.pdf
    • http://majafa.zenlibrarian.com/uploads/1/3/2/8/132814930/besibezebo-sajota-liganipi.pdf
    • http://files.jimhewit.com/uploads/1/3/2/7/132740458/bb1beb2e.pdf
    • https://cdn.shopify.com/s/files/1/0431/8042/5370/files/camille_guide_aram.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/friendly_letters_example.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/teacher_interview_questions_and_answers_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44758106853.pdf
    • https://cdn.shopify.com/s/files/1/0437/6585/8455/files/geometric_distribution_proof.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/jivulije.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/woah_woah_see_that_guy_right_there.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/zinirejiwiloborifokidol.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/nevubixizufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/68894982634.pdf
    • https://cdn.shopify.com/s/files/1/0439/2547/1400/files/bing_ads_tutorial.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000981a.bin
b5114ae6e8b3cac82ff0818a5c9f269b68133fc8a69f873cf1340ab94c419ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x981A 5072 bytes
font_01_sfnt_off0000a957.bin
6f9ddc58242c6aa55f2523ebeaa1dac02c0816a27aa70161e5fef0a66cacd7a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA957 10484 bytes
font_02_sfnt_off0000cd0c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 4324 bytes

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