Malicious PDF — malware analysis report

Static analysis result for SHA-256 161372ebb1328ff8…

MALICIOUS

PDF

373.6 KB Created: 2020-10-01 16:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5225a3c9a26dfb62b588246d9ff1f23 SHA-1: 53731f23fb4e7e182c770e74298c3bd28f0f07ed SHA-256: 161372ebb1328ff88e1c7cf6e19ce3c3f7df305bee9668771f6b5703780e1796
194 Risk Score

Malware Insights

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

The PDF contains embedded URLs and document body text that point to a known malicious redirector, identified by the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK'. The document body also contains a large amount of text related to hypertension, likely as a lure to disguise the malicious intent. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Travel-support phone-number stuffing scam critical SE_TRAVEL_SUPPORT_PHONE_SCAM
    Document repeats phone numbers in airline/travel/refund/support language, often across multiple regional phrasings. This matches SEO/support-scam PDFs that impersonate airlines or travel brands and route users to attacker-controlled call centers rather than a normal travel document.
  • 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://gettraff.ru/strik?keyword=arterial+hypertension+pdf+2017 In PDF document text
    • http://zefuz.shelbylatino.com/uploads/1/3/1/4/131453036/xozatoxut-xusuxopakokati-menifojaduro.pdfIn PDF document text
    • http://files.wasagabeachcorvetteclub.com/uploads/1/3/1/0/131070398/mileluna.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00056617.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00056617.bin)
    • https://uploads.strikinglycdn.com/files/c525f5fc-b88d-4899-9671-ccff6ae4d81a/domezomunogeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aeaed9d-778f-428d-91bc-18b0686c694d/83549937141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/bulezade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9887/9640/files/jowir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/8991/1715/files/swing_low_sweet_chariot_lyrics_etta_james.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9330/5760/files/bovazizawedativurow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/clean_pro_gutter_cleaning_crawfordsville_ar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad93699-5492-4a29-8399-c2f37cc5a739/48370682791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8551ab-63d9-4166-9d98-804ea0b7490a/65941566752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15e6ef7-0d1f-4463-b5ed-6186f18a4deb/furunusejukubibakaxuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bceba8e-740f-498a-b0a7-d21110c466c1/lufanew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f1383f-fbd7-4152-b58d-cec2a39bd646/24519302307.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 extracted file (font_00_sfnt_off00056617.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off0005aed2.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off0005aed2.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00056617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56617 5624 bytes
SHA-256: f6b32e54da5fb7c682ef7f7d67c28d3160015ce45395985b9c93e056314f17eb
font_01_sfnt_off00057946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57946 17244 bytes
SHA-256: bc61aad054a272603599100cc1dcc0824e3de9acb082c570fd30f1946af3f2dd
font_02_sfnt_off0005aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AED2 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648