Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1888aa64211f83c…

MALICIOUS

PDF

101.5 KB Created: 2020-10-25 18:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7ad1d1e43e87f8bd56e074077bf97fc8 SHA-1: d81b1c63e15f842951ce1b3fe52e7912dc1adc34 SHA-256: a1888aa64211f83c5ac735e62fc0d451591925bfde7ca6394eb63c9f5c2bbf2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=amharic+books+pdf+download+free In PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/narolitefiz_gasapatasoda_mepenitaxux_nivegituju.pdfIn PDF document text
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/gajape_melalore_pepamisasi_bujukid.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/ea9082833e000.pdfIn PDF document text
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/4353727.pdfIn PDF document text
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/sakamutepisifad.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/zoninumu.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/wobaruvilumagumude.pdfIn 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/1/0499/8889/4880/files/9589047957.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6700/5848/files/zepekipuwebesebuzegoxal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0524/6112/files/katotapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9609/5397/files/mifipapokato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73aa26e3-bd80-48e1-8559-6291cdcc6a9c/92817096207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af26f247-ffab-43ac-84f1-15d540b0b5a0/71084777522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd12e1d-bb9c-483b-80e7-e0539b45ef41/miwilixujemutibot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5122/0633/files/dates_and_numbers_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9971/6257/files/5.3_feet_in_cm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6862/7384/files/novebituf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/refukojat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/ruger_sr9c_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/xuzowikumozesitegi.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/chaos_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/all_in_one_english_class_10_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/17811926526.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/48427001376.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00008957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8957 69504 bytes
SHA-256: e6f9d0c133e34f539e2d066c6690cf0443df554683c8c2d04a3260cca7436278
font_01_sfnt_off000138ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CE 5680 bytes
SHA-256: 59c019c8b98c8f1ad68f2ff1b4045c530ff07f373ef668684ea5cdb80bb3eea8
font_02_sfnt_off00014bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 11684 bytes
SHA-256: 760316ddcfd5961422c2a11a51f1690553b18b438803f039c5b18220474cf16c
font_03_sfnt_off000172cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172CC 16116 bytes
SHA-256: 7215d12b2cefec752766573a4f881ea7d6f85db6872c2c459707682dfeb8f111