Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3f52b57b0a8861…

MALICIOUS

PDF

46.1 KB Created: 2020-10-27 09:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf8a5ef2f196705d48ca91758f08982e SHA-1: 1db4d1cecfc49ef8290a13fbc1d8d2a3f6b55fdc SHA-256: 4f3f52b57b0a8861852a5b83f9709833fc615e648415dc3cf80a9a7a1b0e307d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Staar test results'. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt 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://gettraff.ru/strik?keyword=staar+test+results+2019+fbisd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0481/5693/4297/files/disney_child_stars_1960s.pdf
    • https://cdn.shopify.com/s/files/1/0494/3049/5399/files/8309957230.pdf
    • https://cdn.shopify.com/s/files/1/0492/4702/7366/files/kexabijakozubipazimewulav.pdf
    • https://cdn.shopify.com/s/files/1/0501/1875/4454/files/jahangirnagar_university_c_unit_result_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/7171/5993/files/labukimagerepa.pdf
    • https://uploads.strikinglycdn.com/files/9ec0e10a-4fad-4649-955c-ff853feddda8/zatiduwadupezonu.pdf
    • https://uploads.strikinglycdn.com/files/e0e7e52a-0dae-4d00-b5f3-e8294e3361c9/30440946707.pdf
    • https://uploads.strikinglycdn.com/files/bacd68b5-118e-45ae-9fed-84cd1d7cba9b/mapabizeb.pdf
    • https://uploads.strikinglycdn.com/files/5454d56f-4554-465c-854a-07157fb95cd9/84846746645.pdf
    • https://cdn.shopify.com/s/files/1/0500/5328/4008/files/75368078267.pdf
    • https://cdn.shopify.com/s/files/1/0437/0795/7400/files/spyro_night_flight_help.pdf
    • https://cdn.shopify.com/s/files/1/0436/4845/0718/files/editor_apk_2020.pdf
    • https://s3.amazonaws.com/wulotugadag/99305438430.pdf
    • https://s3.amazonaws.com/gotenukevepunin/sing_alleluia_clap_your_hands_satb.pdf
    • https://s3.amazonaws.com/donake/70400653039.pdf
    • https://s3.amazonaws.com/wixanarer/boarding_pass_template.pdf
    • https://s3.amazonaws.com/petikamov/biology_projects_for_class_12_ncert_download.pdf
    • https://s3.amazonaws.com/wizidimawag/tinker_tailor_soldier_spy_free.pdf
    • https://s3.amazonaws.com/dowavelaxam/kowokaxepokigevifa.pdf
    • https://s3.amazonaws.com/dukajevo/zulfiqar_ali_bhutto_biography.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/comment_installer_une_camra_de_surveillance_wifi.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_off000066ee.bin
f89f1b11ee950d5b0e820779d67600772539844a895545ec6bde77724687ab8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x66EE 5292 bytes
font_01_sfnt_off000078ee.bin
1098b59a18fd1f5123c6319e4e012877dc9491822d9e10c5d59f8f21b8ac44e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10712 bytes
font_02_sfnt_off00009d0b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0B 4324 bytes