Malicious PDF — malware analysis report

Static analysis result for SHA-256 a160f689d89ea8da…

MALICIOUS

PDF

35.7 KB Created: 2020-08-13 22:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e357611416b9c9f6c59626720168fa7c SHA-1: c38f530ea4fac27f9d9e7c28a123e1b1f915126d SHA-256: a160f689d89ea8da805a1bc37165c4ef14c7d8b0a56c97dcdc125e1ee0040f01
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily corrupted, contains text related to 'pdf file size compressor software free download', suggesting a lure to trick users into clicking the malicious links. 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/wb?keyword=pdf%20file%20size%20compressor%20software%20free%20download
    • http://files.igmlegal.com/uploads/1/3/0/8/130813866/74654dd.pdf
    • http://files.sabatinomangini.com/uploads/1/3/0/8/130874042/bisevan.pdf
    • http://files.siyaozheng.com/uploads/1/3/1/3/131382395/mupiwoxe.pdf
    • http://gezutapo.pecosrifleclub.com/uploads/1/3/0/8/130874431/eb394d0.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/top_producer_8i_login.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8741/0840/files/simple_budget_planner.pdf
    • https://cdn.shopify.com/s/files/1/0447/5407/5799/files/ambulance_driver_certificate_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/wotibimifi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/4022051635.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/thakur_prasad_calendar_august_2020.pdf
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/bible_art_journaling.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/laxurubokubuvumabigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/toziwogodij.pdf
    • https://cdn.shopify.com/s/files/1/0445/6284/1759/files/pestle_analysis_of_airline_industry.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3029/files/brave_new_world_aldous_leonard_huxley.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004def.bin
0061026f083ccfbe3f36b00e23baa353cba9809b5c1c7625d04ddcd85d7c2086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DEF 5444 bytes
font_01_sfnt_off00006071.bin
40ccca2376205397c5dbd1ff43bcc356cc494d42cee7b5f01f6aeb4efaf29dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6071 9692 bytes

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