Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da4574f7b55ad51…

MALICIOUS

PDF

53.8 KB Created: 2020-08-21 01:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2c110d55150f6b972ea3fd6b786581 SHA-1: 1dfb60c68e69d3c35732320b47056c2b05d1c04a SHA-256: 1da4574f7b55ad51c6b23a8ff130ddc166ddf4d89012e792dfd5f7c0d05c2cbf
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially garbled, contains the URL 'https://ttraff.ru/pify?keyword=protein+structure+prediction+tools+pdf', which is flagged as a malicious redirector. The presence of numerous links, including to Shopify domains, suggests a link farm or redirection strategy to distribute malicious content.

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=protein+structure+prediction+tools+pdf
    • http://files.friesenfruits.com/uploads/1/3/1/4/131455832/f5797cd.pdf
    • http://files.mrgarciaswebsite.com/uploads/1/3/1/0/131070072/7927096.pdf
    • http://files.fauxmesticgoddess.com/uploads/1/3/1/8/131856381/gevaxil.pdf
    • http://files.wellnessbidet.com/uploads/1/3/0/7/130776493/87616a7d3.pdf
    • http://files.siglapircc.com/uploads/1/3/1/3/131380292/gaxazu_wikogewiweviva.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/2893048308.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/6483271287.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/fabanulafivoxetar.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/52191590488.pdf
    • https://cdn.shopify.com/s/files/1/0431/9327/0429/files/child_support_agreement_template_ny.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/basic_english_grammar_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/accord_du_participe_pass_avec_avoir_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/adhyathma_ramayanam_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/71208128661.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7727/files/pozixojudosuworojiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/91943540437.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5424/files/holy_bible_software_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/43775418698.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/6030265318.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/geviluvepojutijidom.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_off00007ed6.bin
1fd422a47de7ab0ae04f6c595dc49bda0c3d5efe50fd6a876133c0f2b8f6b48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED6 4824 bytes
font_01_sfnt_off00008f46.bin
9bb61e1ad662dfb2b642ab384fd171f9b2027a3d07cd849bd786c0f200a0b7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F46 14144 bytes
font_02_sfnt_off0000bb0a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 4324 bytes

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