Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ede985c7968666…

MALICIOUS

PDF

44.3 KB Created: 2020-10-28 23:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c46a213acfe08efd6617171326f9d4a SHA-1: 892263ce0f6b8f82209e3e98cfe47f1d96e3d2db SHA-256: b9ede985c79686662396d51e7f428f3bd6b62fb64a423093c72ad89b9f25c658
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/aws?keyword=air+china+baggage', is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to 'Air China baggage' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, including one to 'https://s3.amazonaws.com/kigavanus/vabimorew.pdf', indicates a link farm designed to distribute malicious content or traffic.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?keyword=air+china+baggage In PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/7366576.pdfIn PDF document text
    • https://mixekolasum.weebly.com/uploads/1/3/4/3/134388380/1299421.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/2091873.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/2703082.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/kigavanus/vabimorew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9992/8741/files/kategotekalorusen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9853c2-a124-4945-8edf-dd8667615a09/gupawikuxosukeripani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5d4115-5149-4e30-98ea-b2369b671a6e/sotefedovolod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2622/7093/files/memiloxipumalivejiv.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/fovunuri.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/89838319645.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/april_fools_spelling_test.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/82860707676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c1136d-412c-45b9-bf47-365398f07a6b/60139823120.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3860/5461/files/mamrie_hart_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/preposition_meaning_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/40395949622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7943/2347/files/53507325199.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/vokimexapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0904/0803/files/gozisatupazo.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_off00006d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D68 4980 bytes
SHA-256: 1aaedf74f79a43ffb7e74a0b13c8dab04722f490e845a4c03341356fc81cfa4f
font_01_sfnt_off00007e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E57 11140 bytes
SHA-256: 3d472770515e2ea19a77c1aa51acdf2411389fb1305ce7acc9c981cce3358119

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