Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e7cf30d5a778d5…

MALICIOUS

PDF

50.8 KB Created: 2020-08-31 14:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 529d147c96c7c83e92c4d452466beef8 SHA-1: 5e738413a1004dfd72ffc3f2be6a3d86ad11643b SHA-256: 80e7cf30d5a778d5a51b11f2c4a10bb65262e3d71ad68e926af0124b27443c23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link to a known malicious redirector, ttraff.ru, disguised as an answer key. The document also features a large number of embedded links to other PDFs, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to 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/wix?keyword=quadrilateral+area+sheet+1+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/21e6f2_89ad2e191b4c4c2684c762649661d402.pdf
    • https://static.usrfiles.com/ugd/3aee12_340332e12e734c2fa0f3d78ff1c15041.pdf
    • https://static.usrfiles.com/ugd/1c90dc_b7ce8b7999274efa8e5c59223becc102.pdf
    • https://cdn.shopify.com/s/files/1/0464/6977/5510/files/argentina_nigeria_1994_formacion.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pegofegomena.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/wazinowizavizavotin.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/49975345623.pdf
    • https://cdn.shopify.com/s/files/1/0462/3810/5749/files/ecuaciones_con_x_en_el_denominador_unicoos.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/estado_democratico_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/6956/2266/files/black_and_blue_wallpapers_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/0821/1619/files/megowuzijedekalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/rachmaninoff_vocalise_piano.pdf
    • https://cdn.shopify.com/s/files/1/0448/3871/5552/files/turbotax_donation_value_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0856/files/temporomandibular_joint_ankylosis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f33.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F33 2828 bytes
font_01_sfnt_off0000892e.bin
f781a5a2db37a3e5715328bad97f3627172a1193f88bb1f922bb063ef0afad79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892E 5284 bytes
font_02_sfnt_off00009b37.bin
137d4bef2df4c8d6923a088a4e229eced4b1ae14ecbbccd2c38ac8cd99ecee6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B37 10236 bytes

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