Malicious PDF — malware analysis report

Static analysis result for SHA-256 632de38151caf984…

MALICIOUS

PDF

44.2 KB Created: 2020-10-21 07:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 52c16a3e9969317938fd2e3476934e03 SHA-1: 81ecaa6cf7edfd4d786e84c69dae222a7704c006 SHA-256: 632de38151caf9842a2f1d9e5bc4fac1bdd572b09a3b47afa1708f2d5de1c583
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which are disguised as PDF files hosted on various platforms. The primary redirector URL, https://ttraff.ru/pify?keyword=ptosis+palpebral+en+ni%25C3%25B1os+pdf, is flagged as malicious. This indicates a link farm or SEO poisoning attack designed to redirect users to malicious infrastructure. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.ru/pify?keyword=ptosis+palpebral+en+ni%25C3%25B1os+pdf In PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/zunel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f872dbac5d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f89498aadc6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f8a48a0cc104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f89c838e890c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f8c1ea28b1c0.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/mudewojodiroxowu.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/01df29aaafbfa.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/bagixakas_morazejut.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/fikot-falisomuwex-wepuxixugipa.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/1/0501/6993/8096/files/26660868354.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8650/1806/files/5_minute_rule_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8650/1806/files/ipl_2020_schedule_sunrisers_hyderabad_team.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/5129/4376/files/86363438305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1430/2114/files/57469354818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc3e877-a96b-4cda-9fc1-b6ba05c0c447/98930727741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeeaa2ee-ffc4-40c0-9e18-f5f7cb6afbc4/34096545675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0781bd37-2c31-44f8-b7db-d77cb539df6a/gofuromasawebabunodek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f38ef3-8a85-409c-998a-1508db8f4bac/13260770757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5594091-ada6-45bb-9905-fd357e250113/uss_kitty_hawk_lego.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/tikumibaxijigan.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/juruvatovelodakebosej.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBD 5388 bytes
SHA-256: 517f13b2d9b8d6d2f4f8142c0e7ef3278d4a0b46a77849d0ec6abd93bd5347e2
font_01_sfnt_off00007dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC9 10452 bytes
SHA-256: ef292e2d68d6e869ddb5f1a1dbc639d70ad94948167ffac782b20a2c224ae076