Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dbc07dff9a8c04…

MALICIOUS

PDF

45.4 KB Created: 2020-11-02 08:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0f2194c1a4018a7a8cc371a53f60bd7f SHA-1: d08cb3f006c176a1e46fceb91c566d88c0db34ad SHA-256: 20dbc07dff9a8c04a732c55003f089a87f8f4f541af198365dcab304ab4a27bd
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.me/123?keyword=goldstar+microwave+ma795w In PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/7146875.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/gametuzumax.pdfIn PDF document text
    • https://sokazavuse.weebly.com/uploads/1/3/1/3/131378988/8296045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8f223101a83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_5f9cfed0e2d93.pdfIn PDF document text
    • https://wekowemawifov.weebly.com/uploads/1/3/4/2/134266616/mifiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f8e2c4abf178.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/ae5511c4-bd58-4da2-81a4-c63055e4600a/25521899528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd4003f-8af6-4551-9118-ea42df13daec/wiwupugenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bab9b7-7313-405c-9c00-9d4191cacbc6/40705880123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e23777a-cd53-412f-99cd-7208ec68f276/xitokesebot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a1210f-84fd-42ed-b137-b1177708bf67/52570498882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e08927-d524-4bc9-bf01-89da0f8605c9/mit_guide_to_lockpicking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e90cf14-af0e-4f6e-b29f-e0647c26b54e/36428695782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dea274-4623-4243-87c5-bd1f01ad6586/51970530210.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_off00006490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6490 5308 bytes
SHA-256: d71316e3d332600a3077390dcc935ec871a9c12cd1d5bdc771f8f5a3a52610db
font_01_sfnt_off000076c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76C9 10500 bytes
SHA-256: 3fdc2800f773150170c5497a4efa56f0fb4a6ebe8bc66fef03c137928593c6ac
font_02_sfnt_off00009aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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