Malicious PDF — malware analysis report

Static analysis result for SHA-256 1759d05b3a62a956…

MALICIOUS

PDF

45.1 KB Created: 2020-08-20 23:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee5b1b29e61e4f2ae9928f4e4e9698e4 SHA-1: 2bdbce1c5f6fd3d024c5352c5a04e717754c7052 SHA-256: 1759d05b3a62a956d2dfcfa4bf1c97984e2da6190b5576829de240acd57a97dc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a redirector known for malicious activity. The document body text, though garbled, suggests a lure related to a 'free receipt template', aligning with the SE_INVOICE_LURE heuristic. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to Shopify, suggests a link farm designed to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.cc/pify?keyword=free+receipt+template+word+document
    • http://xirim.w-here2stay.org/uploads/1/3/2/6/132682347/4794229.pdf
    • http://mebedega.dixiehighcounseling.org/uploads/1/3/0/7/130740073/4089089.pdf
    • http://files.algimantascerniauskas.com/uploads/1/3/0/8/130813769/9c1815.pdf
    • http://dedes.vinesnkerr.com/uploads/1/3/1/4/131406082/3722419.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2351/5300/files/arabic_words_meaning_in_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/fegeli.pdf
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/80777878552.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/69779187519.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/jirilowelariwifeparaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8239/0440/files/69424279371.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/werarunekinigazumutovutiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/tirogoxexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/jixamanada.pdf
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/seven_lions_start_again.pdf
    • https://cdn.shopify.com/s/files/1/0429/3217/5014/files/30158035517.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/simebavu.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_off000072de.bin
0e2d9b3d7b91ec227d42bba321b01145d65977297f5130a5ad6c5aca07656680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DE 5088 bytes
font_01_sfnt_off00008421.bin
be4a47f91a2ce94c64818e17850adf35c5f8af14946be256787c6139b9cfdc59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8421 10244 bytes

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