Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbecf09b4dc9471…

MALICIOUS

PDF

55.0 KB Created: 2020-10-25 19:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 148d1edf4cfcfb3fc2068c186eef8c68 SHA-1: 156444c5757fc45e9c70a9fecf658acdf88d4750 SHA-256: 5fbecf09b4dc947131df2ded15a1dea11a67d7703ac7ef2c72fcd64822bb2012
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for an IELTS answer key, which then redirects to the malicious domain. This suggests a phishing or scam attempt using a link farm 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://ggtraff.ru/aws?keyword=focus+on+ielts+foundation+answer+key+pdf In PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/zolifovukub_mofogipuw_suwumop_vafinet.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/navefugiwiru_fogifej.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/vugofavezele-lexupiraroz.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/7343677.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2688/9374/files/solve_quadratic_by_factoring_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5008/1690/files/noxopiwirutija.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3123/5224/files/cruciverbalist_is_a_14-letter_word_for_people_who_enjoy_which_hobby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e9f060-590c-41d2-a7d6-242f23563dcf/11976682251.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/20380568736.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/study_and_master_physical_science_grade_10_caps_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/69296455481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8365/1990/files/onyxia_deep_breath_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/a_little_piece_of_heaven_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0300/5086/files/kuta_graphing_linear_equations_in_slope_intercept_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/monster_genetics_lab_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/mhw_a_summons_from_below.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/abecedrio_em_ingls.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/bitibepikuvovuzile.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/bicarbonate_de_sodium_utilisation.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7563 1644 bytes
SHA-256: c19f0b0b724d861653095ef089a9128b0da3476e65dc7030a61c816ab73800ff
font_01_sfnt_off00007d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D86 5360 bytes
SHA-256: 13c2daf6339a1b508a72195602f8b18aa15a0331c33d767362a4537022ae96c6
font_02_sfnt_off00008fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FED 11176 bytes
SHA-256: 79c05907978b6e7d0261c2ba8a131a1b42f4fe38b081c0433ed9fed0afe881b8
font_03_sfnt_off0000b5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B3 16448 bytes
SHA-256: 585f2253d27f1eed01b83492424e130dc32a5ded7df9afc4ef644268c7042bdc

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