Malicious PDF — malware analysis report

Static analysis result for SHA-256 728d1fc054ca226a…

MALICIOUS

PDF

42.8 KB Created: 2020-07-10 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b982a1780e7078537e78063b91ca7a4d SHA-1: 14cd5c53150b672077e57720dd46cec2682a1738 SHA-256: 728d1fc054ca226a6facc28933a79f0777f88fde397d7cda9f45ea5e2cbef622
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains. One of the embedded URLs, 'https://ttraff.cc/wb?keyword=patrimonio%20cultural%20concepto%20pdf', is identified as a known malicious redirector. The document's structure and the presence of a malicious redirector suggest an attempt to lure users to potentially harmful content, possibly as part of a phishing or malware distribution scheme.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=patrimonio%20cultural%20concepto%20pdf
    • http://files.jewellhjohnson.com/uploads/1/3/2/8/132816158/252b1d3f634b0.pdf
    • http://files.studiowestmaus.com/uploads/1/3/0/9/130969386/4a49c2f5e9.pdf
    • http://files.essentialsspapasadena.com/uploads/1/3/2/6/132681625/2331784.pdf
    • http://files.shipofimagination.com/uploads/1/3/1/6/131637850/49607e966.pdf
    • http://files.lincolncityglasscenter.com/uploads/1/3/1/6/131607010/9477717.pdf
    • http://files.reardondigital.com/uploads/1/3/1/8/131856125/xusipixipe.pdf
    • http://files.misobuildingptyltd.com/uploads/1/3/2/6/132695399/283c6529e301d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pikirumabe.files.wordpress.com/2020/06/61940113873.pdf
    • https://mesipapofus.files.wordpress.com/2020/07/96117558058.pdf
    • https://rutaxitulos.files.wordpress.com/2020/06/67978576275.pdf
    • https://vubagojexub.files.wordpress.com/2020/06/20947875098.pdf
    • https://gojepideg.files.wordpress.com/2020/06/womexolezekasowowatugiz.pdf
    • https://nodezebibun.files.wordpress.com/2020/06/22865800703.pdf
    • https://kimaxawaja.files.wordpress.com/2020/06/48237948132.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26450106566.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_off00006a7d.bin
0ae2a2b983dc885f837321af6db105d31843e22f0eecd75c8f797093e859b14b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7D 5004 bytes
font_01_sfnt_off00007b5c.bin
03d0b5bccfa316be0a646bd0f8ed4039d7e4ddf8402af8cda873e1357fb70c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5C 10692 bytes

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