Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ad2806aaa41882…

MALICIOUS

PDF

45.2 KB Created: 2020-10-24 01:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 55e98a97db277343e3d60186a702d01b SHA-1: 274133c1ac90c880cad95d6cdf5034f0a13f5f44 SHA-256: 65ad2806aaa418828e84da649fd5c674b200a27f162adf0a80bb6219c82919df
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to this redirector. The presence of a large number of external links, many pointing to S3 buckets, suggests a link farm or SEO poisoning attempt to disguise malicious activity. No scripts were extracted, but the heuristic firings strongly indicate malicious redirection.

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://cctraff.ru/strik?keyword=sistema+petrolero+cuenca+tampico+misantla In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f8a70c921263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5f91c644edb42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5f8b26d1c5c6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f872523a2c7d.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/susopuzupure/applications_of_group_theory_in_mathematics.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/xudomavexizaxuw.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/reromefojupigurujiximuni.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/mamojamuviruragikagelelux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1358/5047/files/den_svenska_psalmboken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4083/1155/files/69031899856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8463/7094/files/sears_freezer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3876/1109/files/34595424256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2892/7392/files/risperidone_drug_card.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/23420700867.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/mastering_autodesk_inventor_2019_download.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/vogewukugabed.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/toxaxuvepeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/pagasewa.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/70762437368.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/wokil.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_off00006eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB3 5180 bytes
SHA-256: 09f74a795603e9d71d574575a1d3d8a3c5d53b0fc8c3bee0672ef999bba91b0a
font_01_sfnt_off00008035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8035 11412 bytes
SHA-256: eb5d1c4c974cc7e5d15caa8ea815b39334c6173cd70cde4df6fd5ec57cdaa6e9

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