Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87bd37023147a0d…

MALICIOUS

PDF

68.4 KB Created: 2020-10-25 23:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4d8f6d557e20ca49e0def46970426672 SHA-1: 74030d94793da0a77be76eccd3fba625424bd780 SHA-256: b87bd37023147a0d4feb0c505a2cbdb9261b60446b6eeb9531c74c9d1f1108ee
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL that was flagged by the redirector heuristic. The presence of numerous external PDF links, many pointing to S3 buckets, 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://cctraff.ru/aws?keyword=febrile+neutropenia+guidelines+nccn+pdf In PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/e27909d0be.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/7454624.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/b893a7593d8e.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/ziraweduko.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/522bd37ebe7632.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/badafekukazamasan.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/3cfd05c7.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://s3.amazonaws.com/ditiruz/webome.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/93760777124.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/bipanejividijomazidofib.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/bonus_act_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/16153443260.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/91148031921.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/datation_carbone_14_exercice_corrig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b706aec-137a-45f3-b024-de0161370f29/22713544378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64b194f-d23c-4959-8fe8-4508c668fd1e/78707746523.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/motiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5423/8369/files/vogilupijunalobiza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0514/7808/files/blurring_the_boundaries_short_story.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2372/0602/files/programa_para_cortar_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9582/5314/files/tanalawaxovaneb.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_off0000bc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC85 5300 bytes
SHA-256: 656b828436665a526ee64643ec1a4bf4516b8ccbee6efb8fea1f27ddeafde759
font_01_sfnt_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 11416 bytes
SHA-256: f0571bd807902c4f681c8c595a82d88154f5e059a9636ee8794aabe093ad970a
font_02_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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