Malicious PDF — malware analysis report

Static analysis result for SHA-256 937c10f533e6bf0e…

MALICIOUS

PDF

53.6 KB Created: 2020-10-31 19:38:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ff597700072ee977533286e91f1c38f8 SHA-1: e3e5ddea306d3478aa40af59a659d6dcf8e92560 SHA-256: 937c10f533e6bf0e7be2a601e64e429e0a8617a9cfab137154ed9589bc8fc781
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a redirector URL pointing to 'https://ggtraff.ru/aws?keyword=spotify+crack+apkreal', disguised as a software download lure. This indicates a phishing attempt to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?keyword=spotify+crack+apkreal In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f972056d686e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_5f9391671d4e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f8b759e78bb7.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/1/0266/9661/4079/files/16114872581.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/classroom_objects_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/steel_door_design_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/93812905172.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/meals_on_wheels_houston_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/kemoxaguxanoxanujati.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/jegereragis.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/nomaziriges.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6937/4115/files/togaf_course_content.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/medical_fitness_certificate_sample.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a1a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA1A4 23332 bytes
SHA-256: 42d60bb6f420ff689ce30b67fc9c60e85e7aa6792fc422f418180ce2aaa81448
font_00_sfnt_off00006467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6467 5100 bytes
SHA-256: 5d3118fa534556db277631284dd31d8a0325380177c3584175a7bd791a7297b4
font_01_sfnt_off000075dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DD 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00007e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6A 10196 bytes
SHA-256: e5da334248a0051f6ebc05e407550a049817740c31e4574934e383eaf7f8c118

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