Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43d6218b8fc0279…

MALICIOUS

PDF

44.6 KB Created: 2020-08-11 15:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fa9b93f4605385db228c376e64e43a0 SHA-1: 901194197f211bd3c6cdcd3ef2af67de5f15cde0 SHA-256: a43d6218b8fc0279a6c72e0fcf6352b68d2331e010f1ca3b0aeea85094d71ab3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the PDF structure point towards a malicious document designed to lure users to potentially harmful sites or to manipulate search engine results.

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/pify?keyword=volkswagen+beetle+history+pdf
    • http://bufutopij.maribelalesnayoga.com/uploads/1/3/1/4/131409909/dugijazinu_fizanil.pdf
    • http://files.deborahjonesdesign.com/uploads/1/3/0/7/130776661/xedamasexegi_zovisale_mubomepomo_jolizodi.pdf
    • http://files.gcgeography.org/uploads/1/3/0/7/130738619/rovugaf.pdf
    • http://files.bigfootodyssey.us/uploads/1/3/0/7/130775145/0b155a794e64.pdf
    • https://cdn.shopify.com/s/files/1/0436/4324/0606/files/12040521667.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/41720138019.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/rechtschreibung_deutsch_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/fojowafisutofaxugorarul.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/saxunotogaziniputumi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7623/6950/files/58896472326.pdf
    • https://cdn.shopify.com/s/files/1/0428/3147/8950/files/u_satyanarayana_biochemistry_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5745/files/rataporoxilinurumatafiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/8689635898.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/rename_a_file_in_linux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7543/files/texuput.pdf
    • https://cdn.shopify.com/s/files/1/0432/3377/1688/files/gigovusemazopata.pdf
    • https://cdn.shopify.com/s/files/1/0428/9930/8700/files/short_history_of_ottoman_empire.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0431/8802/7543

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f64.bin
2f3503811a47b539eafa11164d1073d055f6a4862ae644eca69589ebecf1684e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F64 5664 bytes
font_01_sfnt_off000082c2.bin
ea19b25ee47945cc8c045009f073726c5c02ed25d0e5b6fefbfdad80c902b455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C2 9976 bytes

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