Malicious PDF — malware analysis report

Static analysis result for SHA-256 737b61f0ea8661de…

MALICIOUS

PDF

49.8 KB Created: 2020-08-06 22:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98d99a61babe1bc6cdfd436982ab53cf SHA-1: 07933e7debda0e9cffac68179e520d3638756aaa SHA-256: 737b61f0ea8661de29937f659b9db9c46c678e4c9118f50e0438dab96a7073c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body itself is heavily obfuscated but contains references to the malicious URL and benign-looking PDF files hosted on Shopify. This suggests an attempt to lure users to malicious infrastructure, potentially for phishing or malware distribution.

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.cc/pify?keyword=phylum+actinopoda+pdf
    • http://files.garnerconsulting.com/uploads/1/3/1/3/131380619/xerokalawixokajokive.pdf
    • http://files.ncrehabassociation.org/uploads/1/3/0/7/130739789/3030cf.pdf
    • http://files.sunshinehx.org/uploads/1/3/0/8/130874370/jogosafanoku_vomenubezepi_tubewu_gorigepulid.pdf
    • http://files.draytonparish.org/uploads/1/3/1/4/131407194/nukonojaruriga_jebovamul_dibul_mupumuvisamazum.pdf
    • http://files.funprintablesforkids.com/uploads/1/3/2/3/132302816/zowitijoroxes-natukoka-jutom-nusobam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/66681383381.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/21542947892.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/kaxasotowuxipenomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/62093718116.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/39398196261.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/83998410304.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/lirekibumibapusijati.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/commercial_lease_agreement_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/8435/6509/files/revesaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kaxepetumikikexozifaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/business_letter_and_email_writing.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_off0000853a.bin
00d9b9c8b429da4a26a608f6f64684ba9e60253258808da904b017f25154497e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853A 5224 bytes
font_01_sfnt_off000096ea.bin
4ae3d5e2dbfdda1b5ab4f208be113dd4f6c2474cfd56f11ac0f5373f26038b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96EA 10816 bytes

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