Malicious PDF — malware analysis report

Static analysis result for SHA-256 87116384860cb02f…

MALICIOUS

PDF

44.9 KB Created: 2020-08-29 18:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c37faaab74174f2b16fea920d40f5ae0 SHA-1: 35f2afad01c1499d3c86d9c2dcd0f68e6a5cb559 SHA-256: 87116384860cb02f18066cd6654044fcae62b0fe531a19fa708cc9eb66895e68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The presence of a large link farm, coupled with a high ML classifier score, strongly suggests a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document body contains the malicious URL, reinforcing the attack pattern.

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=%25D1%2584%25D1%2580%25D0%25B8%25D0%25BC%25D0%25B5%25D0%25B9%25D0%25BB+%25D0%25BC%25D0%25BE%25D1%258F+%25D0%25BF%25D0%25BE%25D1%2587%25D1%2582%25D0%25B0
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/pdf_botanica_sistematica.pdf
    • https://cdn.shopify.com/s/files/1/0438/0449/1938/files/csgo_famas_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1111/files/gabidudolezirovepoxufi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/titanite_chunk_ds2.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/5465913784.pdf
    • https://static.usrfiles.com/ugd/b8c837_543db91c33644cff86472327345cd088.pdf
    • https://static.usrfiles.com/ugd/b8c837_132b69ffa7884215a1e977c4c89356e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d901285f5b407ca264dc20b77830cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_df6601f92c884f0786c7ba4c1e132fd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_feb4ded13b18475f87ee62feb8003bf0.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6806/files/86754489752.pdf
    • https://cdn.shopify.com/s/files/1/0432/6119/8500/files/78520463579.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/1963_chevy_pickup.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/dawigejofazuxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/33272958658.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/70211985901.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/fedipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/13762957400.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006175.bin
3ac4e51f26776b4c142add7138f9e6d49fda1824f8f36340b4db82aa4e7e52d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6175 5452 bytes
font_01_sfnt_off00007388.bin
ef2cf14aa36cbfd3fcc5f5302b62a0b7966de8a484a842ae3d9391ff0d9cf34f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7388 15772 bytes

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