Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1795bb57e20eb26…

MALICIOUS

PDF

50.4 KB Created: 2020-10-29 17:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 01a9235080be25943b3c0b9bbcc4ee6c SHA-1: 93cc17798606c3da763ac67af2f64bf1da080168 SHA-256: e1795bb57e20eb260f60a0fea9a89d0d0919d57ade20137553e9b46163af1838
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF documents, indicating a link farm or SEO poisoning attempt. One of the primary links, 'https://ttraff.link/123?keyword=al+adab+al+mufrad+urdu', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious URL.

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.link/123?keyword=al+adab+al+mufrad+urdu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8cc93945e63.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/6237118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5f8e3fd8e106a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f872d7a1cf58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f8929e957fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f96f1d8abde0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5f969c9c55191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5f920b7517d25.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/voxipanovigepiv/last_6_months_current_affairs_in_english_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/apoptosis_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8050/6773/files/momapifutirir.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/mepapiwitujibezoji.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/bantay_ng_computer_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/azatioprina_en_perros.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/fejusurexavojapede.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000948f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x948F 21484 bytes
SHA-256: 6c6ac5e24e39be21ca01590421afb9c052be42615d2c7b18fe8e4ec44ac6ce1e
font_00_sfnt_off000053b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53B4 3244 bytes
SHA-256: 9c27258a20bb62834d225a221fd62f9b91072a1fb498807a9633333f5fd4e8cc
font_01_sfnt_off00005f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6B 5004 bytes
SHA-256: e4213e508526eda3a73d52c61eb86e6c60957bbab89f497adc6576057c2d06cc
font_02_sfnt_off00007056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7056 10724 bytes
SHA-256: 1277e0dfe3ed46114fa6ec7e6477419c6007265aa2b0560d03757a2499aa4b3f

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