Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc98513ec60d3439…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 04:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8d256e6e0895f1959cd399bec8f41bf SHA-1: 8dc65862c46fdb566690913d74431e769734297b SHA-256: fc98513ec60d3439190a56a7ed6f14fbe669923a7ea216c7fa558dedf97ad39d
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=hermle+340+020+manual+pdf', suggesting a lure to disguise malicious activity. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

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.com/wix?keyword=hermle+340+020+manual+pdf
    • https://static.usrfiles.com/ugd/432b07_6d427c9f9f5f48e187f1c3b50cc78931.pdf
    • https://static.usrfiles.com/ugd/2813e2_35c4a83940ab4a5180d609ef457815e3.pdf
    • https://static.usrfiles.com/ugd/d3758e_c6a4329e98db441f9b96c2e2611d459b.pdf
    • https://static.usrfiles.com/ugd/b7ed05_c407f9117ab0413097cf9c01746743b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_41e091a9e74441d1ab7d59b58a3b6bc5.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/christopher_hitchens_books_best.pdf
    • https://cdn.shopify.com/s/files/1/0460/3143/7983/files/free_sheet_music_harmonica.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/gupapozesin.pdf
    • https://static.usrfiles.com/ugd/b8c837_b57b2b0d255544c394b9fac200d43de2.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ad1b897190417794d4720556388221.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4cc2e1d8739428d80427be9b2dc7698.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006039.bin
7a8119d6be979d8603822321c48c71d485f170321e63ef81168ce8fad5e3b04d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6039 5496 bytes
font_01_sfnt_off000072d6.bin
4e9dd8e3c77f76b38313969316d3294646cb45c0824c73d70ae96e2ea87dfcb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D6 10472 bytes

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