Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e547480d127505…

MALICIOUS

PDF

46.6 KB Created: 2020-10-26 16:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 89442908c913a1c41143c60ae2fd030d SHA-1: 1b640feadd9bb00487f8fb6260a87c3d6638c1ff SHA-256: f6e547480d127505db0a3881b01a476655cbf08d662eaeb46d57c5b4f160630f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'helping verbs in english pdf' and also includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/123?keyword=use+of+helping+verbs+in+english+pdf In PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/3990354.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/5621902.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/fapebupitebel.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/suputapukeduv-tolegurur-judixokenatofu-xamugokururab.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/1473619.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/4cada.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/8965974.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/5590407.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/fujoratisoxijuwux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jipowumat/vavovewubikowokimoba.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/62730090141.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/gumilawazakajajifoferev.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/comment_fusionner_2_en_un_seul.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/tojativorafijuguj.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/novupinirometolikafugiz.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/rte_application_form_karnataka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11140ffd-1b37-43df-9f10-f12f46694162/gravity_falls_dipper_and_mabel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9e5c18-998c-404a-9d5d-6aba9c9fadf2/kewulige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c41425-6647-42e9-9df4-eac497ff6e5c/12485855032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98b9295-7a09-4d97-a4c2-faf7af9d697a/lodasefoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13dc3456-f0a9-4217-8ee1-623d925d4328/kingdom_come_deliverance_best_light.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0309/1872/files/69895741621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/75304338682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/53410921739.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6050/0926/files/cardiogenic_shock_guidelines.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_off000078d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D1 5284 bytes
SHA-256: 3bcf6003dcbfcc870afadf30f7ea4a7f5f32e895e5b27afda4665e58c8f7a568
font_01_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 9864 bytes
SHA-256: 31edeedaffdf723abb926372fcffce17108a8c8f66f04a4cb77e68a8c4ff5db0

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