Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53bc2a08584dbcb…

MALICIOUS

PDF

41.2 KB Created: 2020-10-02 09:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 729c69f3dc1e6949eeb17c467e963200 SHA-1: 97f3283c43f02d7d5c1011e44ab012db23eb943c SHA-256: e53bc2a08584dbcb3c684979e708b7f49201bfce26cf9bc36701d7dd26c7e5d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are identified as part of a link farm and one is a known malicious redirector. The document body text, though corrupted, contains keywords like 'Picsart download free' suggesting a lure to trick users into visiting these malicious sites. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=picsart+download+free In PDF document text
    • http://xezokivep.jenlasheroriginals.com/uploads/1/3/1/3/131379550/b77e2f29.pdfIn PDF document text
    • http://zamus.chipperstreats.com/uploads/1/3/0/7/130776533/1268811.pdfIn PDF document text
    • http://budez.mochiboutique.com/uploads/1/3/1/3/131382030/c108d2524244c1a.pdfIn PDF document text
    • http://files.blingbyfee.com/uploads/1/3/1/0/131071262/xizilulubifig.pdfIn PDF document text
    • http://filan.pursueposterity.com/uploads/1/3/0/9/130969754/zakezizanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2967bda0-8062-42ec-804a-d516eb16f6bf/70564049764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca371db-b8e4-444f-b68a-35b04a931164/47204276589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63c88d3-29cf-4677-83a7-5ac55e82cb18/sazejedozaniririvuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a909a0f-5dee-4c16-b46d-881696372dd8/77997516674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdabc662-3595-47c5-aa9b-9dd6087cd74b/48146532486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6e08bf-7d35-4135-ae38-66477eecc71e/dujuruwivavusoxat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db878f24-7aa7-43a4-81d5-18f8995abaf3/17431686336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b8d09e-bdfa-4cd2-ae9d-b6815eb63a66/dixixovujusilozusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7efc72-ceb2-4702-9b8a-66872ae871e3/tawigibilolerukogegerobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1beaa0ed-3d77-4d24-8fba-7b4538c43637/12164124189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0becf3-eed3-486e-a1b1-27a9c8619142/netevekizumusenada.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56BD 4896 bytes
SHA-256: 6f565d8ecc8a42e67d73668b479e9f0d5347624729e38bccb06e1c4d9cd9d35b
font_01_sfnt_off00006772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6772 10168 bytes
SHA-256: 407b64cb349e259b59b94f41e3aebfe6cc00465ff652e227a7e84012e9ec288b
font_02_sfnt_off00008a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A20 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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