Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7af142d7802f59…

MALICIOUS

PDF

36.7 KB Created: 2020-10-11 23:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c1e3796f35d51360b24bf45581b632b SHA-1: 3a6b54be3e8d9512923a4c11fbaf9038dec7eb91 SHA-256: 4c7af142d7802f5924f81d7547149edcde7ebbaf06834840c806e7795e759e0a
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=the+kite+runner+test+answers, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users into clicking malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.ru/pify?keyword=the+kite+runner+test+answers In PDF document text
    • https://site-1041611.mozfiles.com/files/1041611/vazesavigusilijakutibuja.pdfIn PDF document text
    • https://site-1039343.mozfiles.com/files/1039343/rikodiwu.pdfIn PDF document text
    • https://site-1039783.mozfiles.com/files/1039783/gapulomerikopejelonibat.pdfIn PDF document text
    • http://kelide.charlesjgruichmd.com/uploads/1/3/1/6/131637140/lidogimat-nomexixawof.pdfIn PDF document text
    • http://tetexuwu.rampensau.training/uploads/1/3/1/4/131406893/pufadezu.pdfIn PDF document text
    • http://nakulare.brandito.net/uploads/1/3/0/7/130776008/c0512094658.pdfIn PDF document text
    • http://files.tathrabeachcountryclub.com/uploads/1/3/0/8/130873918/nekerakadazopikasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21bca5d-eb61-4a24-a669-a7bfeaa751dc/34858817245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95bee2b-74a7-4eb4-94b7-2eeed9f2a8bf/71047058054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6260fbed-255f-493c-a0c2-fee043628453/bafevurumosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c80137-a1f1-47fb-acca-967ecca13b95/vasorabilasoxugefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e363714-10c4-438f-9297-0495d3b00ab9/zebopowivulekodojotew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860e2a96-d8d2-4155-9ff2-cb10b89bc1d2/dizeromisaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea8df83-5522-44a3-b305-3b40246464ba/48089359453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b62492-bc49-4f17-9b7e-b8476578ee6a/jakamut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcb3061-e346-48d7-947d-6475e1ab2516/metobivawetek.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_off000053f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53F7 4848 bytes
SHA-256: b0f8c78541fc7bf2f92d3c7ecf9f5d42b174ebc94bd3ae08c520d38f9b55fb5a
font_01_sfnt_off0000647f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 9700 bytes
SHA-256: ae26f118baeb3fc2b28689002c4e61722d8aa5db9f960c041784bf98c8457aad

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