Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b7aaeae69c3d44…

MALICIOUS

PDF

40.6 KB Created: 2020-08-07 10:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cc4e2dd111476fe85d650768c6c580f SHA-1: 08a5d7295f5f4bdb40c00d73435fb9a49ef71a33 SHA-256: 16b7aaeae69c3d44a1516ed20a7696dc6b014cef0cbd30f738deabcb0ef7e7a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to link farms and redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=algebra+formulas+pdf+in+telugu, which is flagged as a malicious redirector. This suggests the document is designed to lead users to potentially harmful websites under the guise of providing educational 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=algebra+formulas+pdf+in+telugu
    • http://files.jodibaldacci.com/uploads/1/3/0/7/130739778/muleti-nefuwofuxolof-mujutajolabi-pakufinetajol.pdf
    • http://files.sensibleshock.com/uploads/1/3/2/7/132740479/vasesejakukek_faxej_lelikam.pdf
    • http://files.apiswc.org/uploads/1/3/2/6/132680903/nitivujevakipuxode.pdf
    • http://lasekusa.midmichiganfamilyfun.com/uploads/1/3/0/7/130775432/504451.pdf
    • http://widobete.oursaviorsstx.org/uploads/1/3/1/3/131398140/9839889.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/fegoxakumobikumisono.pdf
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/cell_phone_advantages_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/41708013394.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/17914905376.pdf
    • https://cdn.shopify.com/s/files/1/0432/0080/7074/files/52547741589.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/business_communication_email_writing_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35403674757.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8664/files/vetifosozatawud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4936/1314/files/wajeliluregil.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/xutugevudekuwajusedolabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/brgschaftserklrung_eltern.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3090/files/bsc_physics_syllabus_burdwan_university.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/types_of_admixture_in_concrete.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_off00005f94.bin
799219062407b821c15334c3d1d8dc91b1f5754059b5d1eceba751e7b25d9f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F94 5492 bytes
font_01_sfnt_off00007224.bin
2f02630c70c12d06182a1cbe5347a2f3dac505f2a7002a0bebd86ad9e9ca7b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7224 10316 bytes

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