Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8303a652c76cdfc…

MALICIOUS

PDF

71.9 KB Created: 2020-10-27 15:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3bae9bb001544228866f00db926ab766 SHA-1: 9dab4fe46c7b777c2853816ad38cdeac83dcb648 SHA-256: a8303a652c76cdfcd82356edf4ef38e210ba3779bab823857062a1e6156aeee5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link and a link farm, indicating an attempt to distribute or redirect to malicious content. The embedded URL points to a redirector, which is a common tactic for distributing malware or phishing pages. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/123?keyword=widest+division+of+the+large+intestine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f8e2987a34cd.pdfIn PDF document text
    • https://ragidogatekanex.weebly.com/uploads/1/3/4/3/134388076/xosopuw.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/8349324.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/2730718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f876367750a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f8ba4b6d137e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f8f42e862739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f94cb0437df9.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/tadovu/zizugixufaxijunal.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/bewitchment_must_die.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/20618687635.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4835/1944/files/winnie_the_pooh_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5255/6184/files/27807444273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/fazagisufuvipugusinadewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/bubirafigupidapipevim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/free_subject_verb_agreement_worksheets_for_first_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0174/0964/files/bluebeam_edit_text_in.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9470/2763/files/netflix_apk_android_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5281/2456/files/samsung_65_suhd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1114/5365/files/double_entry_system_format.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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 5240 bytes
SHA-256: 7553670118eb9c5456b70ca91b3db3abd2c8ecf63246a661f407253bcabba686
font_01_sfnt_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 11820 bytes
SHA-256: be8741c61a85017294890138dcbf0355e59e8abe71dca3f18ca929a7f7927242

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