Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c21cabab6fbb4e2…

MALICIOUS

PDF

84.6 KB Created: 2020-10-25 18:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 31a9f989bc9e0113496d7c1faceed6e0 SHA-1: 1f22d5e9669da5bea6197be86c5a5c4dde4d7708 SHA-256: 4c21cabab6fbb4e2c7cf89513d6e6994cd559fe51ad0c6697e6299771c8b0e55
152 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.8481

Heuristics 3

  • 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.
  • 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
    • 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

Extracted artifacts 2

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

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