Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c47d5acbb6f4a7…

MALICIOUS

PDF

49.2 KB Created: 2020-10-22 09:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: dcbd2f02cc2a1aeffa83046b79cbab7e SHA-1: 85147bacdb33ed8a0e33a340722e12b33dc8894a SHA-256: 97c47d5acbb6f4a7235f24e02b47cf7c8f829a83f9023a26be890f0e33fef685
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector services and link farms designed to distribute malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure, indicating an attempt to direct users to harmful sites. The ML classifier also strongly indicates maliciousness.

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/pify?keyword=legge+di+ohm+formule+pdf In PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/lejesof_jenizo.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/baxitofapore-tolofanipinem-bajofike.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/a37e269a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6336/0701/files/radiation_exposure_in_pregnancy_guidelines_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3669/6725/files/federal_poverty_guidelines_2020_illinois.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/vijayanagar_and_bahmani_kingdom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8155/8933/files/64330585114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4415/0689/files/vikufofawinofafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5515/3303/files/android_scaletype_for_background.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0182/5448/files/xizabep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9151/6310/files/zutekigojarazimimajuzetoj.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/54772777766.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/find_cumulative_distribution_function_given.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/74554217721.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/bejisojobalutefewewa.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/34746397118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b60f31-f3f3-4b8f-a132-c83d4b89212b/free_social_stories_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaab4b68-ab09-4592-b102-f191063d7b9c/58595218638.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7512 4704 bytes
SHA-256: 371a4d6c28ae02fbddb707b3604f8ddf0202d47cebff7271f908a2c279befaf2
font_01_sfnt_off0000850c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850C 11112 bytes
SHA-256: a936165f51c452e3aeb7469acfd6bf856855295765629255de076e267f2b9374
font_02_sfnt_off0000a91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA91B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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