Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b7d1b893038136…

MALICIOUS

PDF

43.4 KB Created: 2020-11-03 00:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bdf5fcc636c53c54523c74cb2b5d5e31 SHA-1: 97c69e110d592dc82a0ede62f86d1269af622c1d SHA-256: 43b7d1b89303813625ca50202064183463711db1c7febac837a587d6a85b34e7
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a high number of embedded links, a technique often used in SEO link farms to manipulate search engine rankings. One of these links, https://ttraff.ru/123?keyword=bassi+falls+trail, is identified as pointing to known malicious redirector infrastructure. While no scripts were extracted, the presence of numerous links suggests an attempt to lure users to potentially harmful websites.

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.ru/123?keyword=bassi+falls+trail In PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/4fa0ee48.pdfIn PDF document text
    • https://xipazodi.weebly.com/uploads/1/3/4/3/134375507/4df829e6.pdfIn PDF document text
    • https://luleloneluso.weebly.com/uploads/1/3/4/4/134450102/vitukamaxovamed_waluletutu.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://s3.amazonaws.com/busutafitufe/44690775780.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0834/3194/files/samsung_imei_repair_software.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/38247216626.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/bifumofivisa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7685/3153/files/17827936072.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/wazosab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/8528/0449/files/zotijidurisanawejemidi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9910/5701/files/97572591531.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_off00005fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FED 4264 bytes
SHA-256: a286f5c67ac82b86ea92d6ae7d5f17d2de4c89f7f51099b6c126e986a41d124f
font_01_sfnt_off00006e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 10840 bytes
SHA-256: decf8767e5d064624908c208f58677a303aa248ae9eb2c8794b6ba068ba77192
font_02_sfnt_off0000936f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x936F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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