Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a017abb1542596…

MALICIOUS

PDF

42.9 KB Created: 2020-10-31 13:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e76df7f53789f72611697547085e9dcc SHA-1: 1c3623cdf325afa0d704f72c5a8d4ca7725f64a4 SHA-256: 27a017abb154259621293d24bc9fc205564443d9df79f89a1449229657835ed9
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and the list of embedded URLs. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

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://ttraff.club/123?keyword=how+many+cloth+diapers+do+i+need+for+baby In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f9d132d3f3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f94da716eee7.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/ganubatebedoxez/54117399365.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/arizona_driver_license_manual_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7915/3813/files/79597839646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a70cc81-bc76-44ad-9a76-3cf305e2589f/18948101530.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/72694829419.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/obc_caste_list_in_tamilnadu_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/32932361439.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/73435554945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc1ceb83-756a-4776-a188-b8490532d9d8/jenewewisitavisus.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_off00006884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6884 5688 bytes
SHA-256: dbb89cdf98ff93813bc87120d20336254cbeb24658d2b86c8d2134db05ba7b34
font_01_sfnt_off00007bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBA 10400 bytes
SHA-256: a2db66426cdf1c927e79e7bd09fa9d9de6b7eff41c68d6b09056905639f5db42